Bump gvar from 13.1 to 13.1.1

Bumps [gvar](https://github.com/gplepage/gvar) from 13.1 to 13.1.1.
- [Release notes](https://github.com/gplepage/gvar/releases)
- [Changelog](https://github.com/gplepage/gvar/blob/main/CHANGES.txt)
- [Commits](gplepage/gvar@v13.1...v13.1.1)

---
updated-dependencies:
- dependency-name: gvar
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

extra_requirements/requirements-tests.txt

@@ -2,7 +2,7 @@ corner==2.2.1
 coveralls==4.0.1
 emcee==3.1.4
 gitpython==3.1.43
-gvar==13.1
+gvar==13.1.1
 h5py==3.11.0
 hypothesis==6.21.1
 immutabledict==4.2.0