[PIP] Bump python-gnupg from 0.5.2 to 0.5.3

Bumps [python-gnupg](https://github.com/vsajip/python-gnupg) from 0.5.2 to 0.5.3.
- [Release notes](https://github.com/vsajip/python-gnupg/releases)
- [Changelog](https://github.com/vsajip/python-gnupg/blob/master/release)
- [Commits](vsajip/python-gnupg@0.5.2...0.5.3)

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

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

test_requirements.txt

@@ -1,5 +1,5 @@
 # Test requirements
 pytest>=7.0.0,<=8.3.3
 pytest-subtests>=0.12.0,<=0.13.1
-python-gnupg==0.5.2
+python-gnupg==0.5.3
 trustme>=1.1.0,<1.2