chore(deps): bump github.com/go-git/go-billy/v5 from 5.7.0 to 5.9.0

Bumps [github.com/go-git/go-billy/v5](https://github.com/go-git/go-billy) from 5.7.0 to 5.9.0.
- [Release notes](https://github.com/go-git/go-billy/releases)
- [Commits](https://github.com/go-git/go-billy/compare/v5.7.0...v5.9.0)

---
updated-dependencies:
- dependency-name: github.com/go-git/go-billy/v5
  dependency-version: 5.9.0
  dependency-type: indirect
...

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

vendor/golang.org/x/crypto/ssh/agent/server.go

@@ -36,7 +36,7 @@ func (s *server) processRequestBytes(reqData []byte) []byte {
 		return []byte{agentFailure}
 	}
 
-	if err == nil && rep == nil {
+	if rep == nil {
 		return []byte{agentSuccess}
 	}