Deps: Bump httpx from 0.24.1 to 0.25.0 in /helm-version-upgrade

Bumps [httpx](https://github.com/encode/httpx) from 0.24.1 to 0.25.0.
- [Release notes](https://github.com/encode/httpx/releases)
- [Changelog](https://github.com/encode/httpx/blob/master/CHANGELOG.md)
- [Commits](encode/httpx@0.24.1...0.25.0)

---
updated-dependencies:
- dependency-name: httpx
  dependency-type: indirect
  update-type: version-update:semver-minor
...

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