Update playwright requirement in the browsergym-related group

Updates the requirements on [playwright](https://github.com/microsoft/playwright-python) to permit the latest version.

Updates `playwright` to 1.50.0
- [Release notes](https://github.com/microsoft/playwright-python/releases)
- [Commits](microsoft/playwright-python@v1.49.1...v1.50.0)

---
updated-dependencies:
- dependency-name: playwright
  dependency-type: direct:production
  dependency-group: browsergym-related
...

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

Author: dependabot[bot]

requirements.txt

@@ -22,4 +22,4 @@ duckduckgo_search~=7.5.1
 aiofiles~=24.1.0
 pydantic_core~=2.27.2
 colorama~=0.4.6
-playwright~=1.49.1
+playwright~=1.50.0