Update recommended opa agent version

devops/aws/opa/values.yaml

@@ -12,4 +12,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-image: openpolicyagent/opa:0.62.1
+image: openpolicyagent/opa:0.64.1

docs/docs/opa.md

@@ -7,12 +7,13 @@
 
 - Recommended versions
 
-| Milestone   | Open Policy Agent Recommended Version |
-| ----------- | ------------------------------------- |
-| M18         | v0.54 or later                        |
-| M21         | v0.56 or later                        |
-| M22         | v0.62.1 or later                      |
-| M23         | v0.62.1 or later                      |
+| Milestone | Open Policy Agent Recommended Version |
+|-----------|---------------------------------------|
+| M18       | v0.54 or later                        |
+| M21       | v0.56 or later                        |
+| M22       | v0.62.1 or later                      |
+| M23       | v0.62.1 or later                      |
+| M24       | v0.64.1 or later                      |
 
 ## Role
 - Currently Policy Service is not compatible with OPA version 1.x syntax, so do not use the `-v1-compatible` flag.