Bump langchain-core from 1.2.17 to 1.2.19 in /tests/python_tests (openvinotoolkit#3500)

Bumps [langchain-core](https://github.com/langchain-ai/langchain) from
1.2.17 to 1.2.19.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/langchain-ai/langchain/releases">langchain-core's
releases</a>.</em></p>
<blockquote>
<h2>langchain-core==1.2.19</h2>
<p>Changes since langchain-core==1.2.18</p>
<p>release(core): 1.2.19 (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/35832">#35832</a>)
chore(core): move BaseCrossEncoder to langchain-core (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/35809">#35809</a>)
chore: bump tornado from 6.5.2 to 6.5.5 in /libs/core (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/35775">#35775</a>)</p>
<h2>langchain-core==1.2.18</h2>
<p>Changes since langchain-core==1.2.17</p>
<p>release(core): 1.2.18 (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/35704">#35704</a>)
fix(core): fix double backticks in deprecation docstring for
alternative_import (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/35658">#35658</a>)
fix(core): preserve default_factory when generating tool call schema (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/35550">#35550</a>)
feat(openai): support tool search (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/35582">#35582</a>)
chore: bump the minor-and-patch group across 3 directories with 7
updates (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/35605">#35605</a>)</p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/langchain-ai/langchain/commit/41cca203e633d8506b563f263b005cb52909300d"><code>41cca20</code></a>
release(core): 1.2.19 (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/35832">#35832</a>)</li>
<li><a
href="https://github.com/langchain-ai/langchain/commit/307cdcac9e4e3d7cdcc86eeb3a4688b486f8e1d8"><code>307cdca</code></a>
chore(core): move BaseCrossEncoder to langchain-core (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/35809">#35809</a>)</li>
<li><a
href="https://github.com/langchain-ai/langchain/commit/cee6430b1cd2530cdebcdb8820ed4ebf700556a4"><code>cee6430</code></a>
refactor(xai): remove redundant <code>lc_attributes</code> override (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/35791">#35791</a>)</li>
<li><a
href="https://github.com/langchain-ai/langchain/commit/6b9b4c6546332346b787f337b92879fc9b6b530c"><code>6b9b4c6</code></a>
feat(xai): support <code>base_url</code> alias and
<code>XAI_API_BASE</code> env var (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/35790">#35790</a>)</li>
<li><a
href="https://github.com/langchain-ai/langchain/commit/b676167707b9c8e27feef7e58a11edb0fe011703"><code>b676167</code></a>
fix(deepseek): accept <code>base_url</code> as alias for
<code>api_base</code> (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/35789">#35789</a>)</li>
<li><a
href="https://github.com/langchain-ai/langchain/commit/5d9568b5f5a94ef21bee094f38694415e099ed73"><code>5d9568b</code></a>
feat(model-profiles): new fields + <code>Makefile</code> target (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/35788">#35788</a>)</li>
<li><a
href="https://github.com/langchain-ai/langchain/commit/1891d414beceeef8e23a05e9e8f6011ccbf4d8b2"><code>1891d41</code></a>
chore: bump tornado from 6.5.2 to 6.5.5 in /libs/text-splitters (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/35774">#35774</a>)</li>
<li><a
href="https://github.com/langchain-ai/langchain/commit/1d954bccfad779097f63688b324f82fed48f4c5e"><code>1d954bc</code></a>
chore: bump tornado from 6.5.2 to 6.5.5 in /libs/langchain (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/35773">#35773</a>)</li>
<li><a
href="https://github.com/langchain-ai/langchain/commit/261b1d57e40b8470673d923b925aeed58415bc59"><code>261b1d5</code></a>
chore: bump tornado from 6.5.2 to 6.5.5 in /libs/core (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/35775">#35775</a>)</li>
<li><a
href="https://github.com/langchain-ai/langchain/commit/9521c679db9641912b97297d434adc8d000b5a9c"><code>9521c67</code></a>
fix(openai): close PIL Image handles in token counting to prevent fd
leak (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/3">#3</a>...</li>
<li>Additional commits viewable in <a
href="https://github.com/langchain-ai/langchain/compare/langchain-core==1.2.17...langchain-core==1.2.19">compare
view</a></li>
</ul>
</details>
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tests/python_tests/requirements.txt

@@ -10,7 +10,7 @@ gguf==0.18.0
 
 # rag requirements
 langchain_community==0.4.1
-langchain-core==1.2.17
+langchain-core==1.2.19
 
 # requirements for specific models
 # - Qwen/Qwen-7B