Bump composer/ca-bundle from 1.5.5 to 1.5.6

Bumps [composer/ca-bundle](https://github.com/composer/ca-bundle) from 1.5.5 to 1.5.6.
- [Release notes](https://github.com/composer/ca-bundle/releases)
- [Commits](composer/ca-bundle@1.5.5...1.5.6)

---
updated-dependencies:
- dependency-name: composer/ca-bundle
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]