chore(deps): bump github.com/open-policy-agent/opa from 0.65.0 to 0.67.1

Bumps [github.com/open-policy-agent/opa](https://github.com/open-policy-agent/opa) from 0.65.0 to 0.67.1.
- [Release notes](https://github.com/open-policy-agent/opa/releases)
- [Changelog](https://github.com/open-policy-agent/opa/blob/main/CHANGELOG.md)
- [Commits](https://github.com/open-policy-agent/opa/compare/v0.65.0...v0.67.1)

---
updated-dependencies:
- dependency-name: github.com/open-policy-agent/opa
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

vendor/github.com/open-policy-agent/opa/loader/errors.go

@@ -41,7 +41,7 @@ func (e *Errors) add(err error) {
 type unsupportedDocumentType string
 
 func (path unsupportedDocumentType) Error() string {
-	return string(path) + ": bad document type"
+	return string(path) + ": document must be of type object"
 }
 
 type unrecognizedFile string