build(deps): bump github.com/open-policy-agent/opa from 1.6.0 to 1.8.0

Bumps [github.com/open-policy-agent/opa](https://github.com/open-policy-agent/opa) from 1.6.0 to 1.8.0.
- [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/v1.6.0...v1.8.0)

---
updated-dependencies:
- dependency-name: github.com/open-policy-agent/opa
  dependency-version: 1.8.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

vendor/github.com/segmentio/asm/internal/unsafebytes/unsafebytes.go

@@ -0,0 +1,20 @@
+package unsafebytes
+
+import "unsafe"
+
+func Pointer(b []byte) *byte {
+	return *(**byte)(unsafe.Pointer(&b))
+}
+
+func String(b []byte) string {
+	return *(*string)(unsafe.Pointer(&b))
+}
+
+func BytesOf(s string) []byte {
+	return *(*[]byte)(unsafe.Pointer(&sliceHeader{str: s, cap: len(s)}))
+}
+
+type sliceHeader struct {
+	str string
+	cap int
+}