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 1.10.5 to 1.10.6.
- [Release notes](https://github.com/sigstore/sigstore/releases)
- [Commits](sigstore/sigstore@v1.10.5...v1.10.6)

---
updated-dependencies:
- dependency-name: github.com/sigstore/sigstore/pkg/signature/kms/hashivault
  dependency-version: 1.10.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

go.mod

@@ -44,7 +44,7 @@ require (
 	github.com/sigstore/sigstore/pkg/signature/kms/aws v1.10.5
 	github.com/sigstore/sigstore/pkg/signature/kms/azure v1.10.5
 	github.com/sigstore/sigstore/pkg/signature/kms/gcp v1.10.5
-	github.com/sigstore/sigstore/pkg/signature/kms/hashivault v1.10.5
+	github.com/sigstore/sigstore/pkg/signature/kms/hashivault v1.10.6
 	go.opentelemetry.io/otel v1.43.0
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.43.0
 	go.opentelemetry.io/otel/metric v1.43.0