build(deps): bump mitmproxy from 11.0.0 to 11.1.2 in /tests

Bumps [mitmproxy](https://github.com/mitmproxy/mitmproxy) from 11.0.0 to 11.1.2.
- [Release notes](https://github.com/mitmproxy/mitmproxy/releases)
- [Changelog](https://github.com/mitmproxy/mitmproxy/blob/main/CHANGELOG.md)
- [Commits](mitmproxy/mitmproxy@v11.0.0...v11.1.2)

---
updated-dependencies:
- dependency-name: mitmproxy
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

tests/requirements.txt

@@ -5,4 +5,4 @@ msgpack==1.0.8
 pytest-xdist==3.5.0
 clang-format==19.1.3
 pywin32==308; sys_platform == "win32"
-mitmproxy==11.0.0
+mitmproxy==11.1.2