fix(dependencies): Bump types-openpyxl

Bumps [types-openpyxl](https://github.com/python/typeshed) from 3.1.5.20260508 to 3.1.5.20260518.
- [Commits](https://github.com/python/typeshed/commits)

---
updated-dependencies:
- dependency-name: types-openpyxl
  dependency-version: 3.1.5.20260518
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

pyproject.toml

@@ -29,7 +29,7 @@ dev = [
     "pytest-cov>=7.0.0",
     "ruff>=0.15.13",
     "ty>=0.0.37",
-    "types-openpyxl>=3.1.5.20260508",
+    "types-openpyxl>=3.1.5.20260518",
 ]
 
 [tool.ruff.lint.pydocstyle]