[Dependabot]: Update mypy requirement from ~=1.19 to ~=1.20

Updates the requirements on [mypy](https://github.com/python/mypy) to permit the latest version.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.19.0...v1.20.0)

---
updated-dependencies:
- dependency-name: mypy
  dependency-version: 1.20.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

tests/typing/requirements.txt

@@ -1,6 +1,6 @@
 -r ../../requirements.txt
 
 # Static Type Checking
-mypy[reports] ~= 1.19
+mypy[reports] ~= 1.20
 typing_extensions ~= 4.15
 lxml >= 5.4, <7.0