Bump notebook from 7.4.2 to 7.5.6

Bumps [notebook](https://github.com/jupyter/notebook) from 7.4.2 to 7.5.6.
- [Release notes](https://github.com/jupyter/notebook/releases)
- [Changelog](https://github.com/jupyter/notebook/blob/@jupyter-notebook/tree@7.5.6/CHANGELOG.md)
- [Commits](https://github.com/jupyter/notebook/compare/@jupyter-notebook/tree@7.4.2...@jupyter-notebook/tree@7.5.6)

---
updated-dependencies:
- dependency-name: notebook
  dependency-version: 7.5.6
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

ci/requirements.txt

@@ -1501,9 +1501,9 @@ nest-asyncio==1.6.0 \
     --hash=sha256:6f172d5449aca15afd6c646851f4e31e02c598d553a667e38cafa997cfec55fe \
     --hash=sha256:87af6efd6b5e897c81050477ef65c62e2b2f35d51703cae01aff2905b1852e1c
     # via ipykernel
-notebook==7.4.2 \
-    --hash=sha256:9ccef602721aaa5530852e3064710b8ae5415c4e2ce26f8896d0433222755259 \
-    --hash=sha256:e739defd28c3f615a6bfb0a2564bd75018a9cc6613aa00bbd9c15e68eed2de1b
+notebook==7.5.6 \
+    --hash=sha256:4dde3f8fb55fa8fb7946d58c6e869ce9baf46d00fc070664f62604569d0faca0 \
+    --hash=sha256:621174aade80108f0020b0f00738000b215f75fa3cd90771ad7aa0f24536a4e1
     # via jupyter
 notebook-shim==0.2.4 \
     --hash=sha256:411a5be4e9dc882a074ccbcae671eda64cceb068767e9a3419096986560e1cef \