build(deps): bump github.com/sigstore/sigstore/pkg/signature/kms/hashivault

Bumps [github.com/sigstore/sigstore/pkg/signature/kms/hashivault](https://github.com/sigstore/sigstore) from 1.9.4 to 1.9.5.
- [Release notes](https://github.com/sigstore/sigstore/releases)
- [Commits](sigstore/sigstore@v1.9.4...v1.9.5)

---
updated-dependencies:
- dependency-name: github.com/sigstore/sigstore/pkg/signature/kms/hashivault
  dependency-version: 1.9.5
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

go.mod

@@ -45,7 +45,7 @@ require (
 	github.com/sigstore/sigstore/pkg/signature/kms/aws v1.9.4
 	github.com/sigstore/sigstore/pkg/signature/kms/azure v1.9.5
 	github.com/sigstore/sigstore/pkg/signature/kms/gcp v1.9.5
-	github.com/sigstore/sigstore/pkg/signature/kms/hashivault v1.9.4
+	github.com/sigstore/sigstore/pkg/signature/kms/hashivault v1.9.5
 	go.opentelemetry.io/otel v1.36.0
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.36.0
 	go.opentelemetry.io/otel/sdk v1.36.0