Update vcrpy requirement from ==4.4.* to ==6.0.* in /requirements

Updates the requirements on [vcrpy](https://github.com/kevin1024/vcrpy) to permit the latest version.
- [Release notes](https://github.com/kevin1024/vcrpy/releases)
- [Changelog](https://github.com/kevin1024/vcrpy/blob/master/docs/changelog.rst)
- [Commits](kevin1024/vcrpy@v4.4.0...v6.0.1)

---
updated-dependencies:
- dependency-name: vcrpy
  dependency-type: direct:development
...

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

requirements/requirements-dev.txt

@@ -1,5 +1,5 @@
 # Requirements for running the tests
-vcrpy==4.4.*
+vcrpy==6.0.*
 pytest==8.2.*
 pytest-recording==0.13.*
 pytest-cov==4.1.*