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/util/decoding/context.go

@@ -0,0 +1,31 @@
+package decoding
+
+import "context"
+
+type requestContextKey string
+
+// Note(philipc): We can add functions later to add the max request body length
+// to contexts, if we ever need to.
+const (
+	reqCtxKeyMaxLen     = requestContextKey("server-decoding-plugin-context-max-length")
+	reqCtxKeyGzipMaxLen = requestContextKey("server-decoding-plugin-context-gzip-max-length")
+)
+
+func AddServerDecodingMaxLen(ctx context.Context, maxLen int64) context.Context {
+	return context.WithValue(ctx, reqCtxKeyMaxLen, maxLen)
+}
+
+func AddServerDecodingGzipMaxLen(ctx context.Context, maxLen int64) context.Context {
+	return context.WithValue(ctx, reqCtxKeyGzipMaxLen, maxLen)
+}
+
+// Used for enforcing max body content limits when dealing with chunked requests.
+func GetServerDecodingMaxLen(ctx context.Context) (int64, bool) {
+	maxLength, ok := ctx.Value(reqCtxKeyMaxLen).(int64)
+	return maxLength, ok
+}
+
+func GetServerDecodingGzipMaxLen(ctx context.Context) (int64, bool) {
+	gzipMaxLength, ok := ctx.Value(reqCtxKeyGzipMaxLen).(int64)
+	return gzipMaxLength, ok
+}