Update portalocker requirement from ~=2.5.1 to ~=2.6.0

Updates the requirements on [portalocker](https://github.com/WoLpH/portalocker) to permit the latest version.
- [Release notes](https://github.com/WoLpH/portalocker/releases)
- [Changelog](https://github.com/WoLpH/portalocker/blob/develop/CHANGELOG.rst)
- [Commits](wolph/portalocker@v2.5.1...v2.6.0)

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

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

requirements.txt

@@ -86,7 +86,7 @@ parso~=0.8.3
 pickleshare~=0.7.5
 Pillow~=9.2.0
 pluggy~=1.0.0
-portalocker~=2.5.1
+portalocker~=2.6.0
 prometheus-client~=0.15.0
 prompt-toolkit~=3.0.31
 protobuf~=4.21.7