Bump spiffe from 0.2.1 to 0.2.2 in /spiffe-tls (#327)

Bumps [spiffe](https://github.com/HewlettPackard/py-spiffe) from 0.2.1 to 0.2.2.
- [Release notes](https://github.com/HewlettPackard/py-spiffe/releases)
- [Commits](spiffe-v0.2.1...spiffe-v0.2.2)

---
updated-dependencies:
- dependency-name: spiffe
  dependency-version: 0.2.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]