build(deps): bump the examples-ext-authz group

Bumps the examples-ext-authz group in /examples/ext_authz with 1 update: openpolicyagent/opa.


Updates `openpolicyagent/opa` from 0.61.0-istio to 0.62.0-istio

---
updated-dependencies:
- dependency-name: openpolicyagent/opa
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: examples-ext-authz
...

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

examples/ext_authz/Dockerfile-opa

@@ -1 +1 @@
-FROM openpolicyagent/opa:0.61.0-istio@sha256:5ee86eb43bbe8a80e24d4d218a7fd568e5e5c1a782f20aa03a5643cad307034f
+FROM openpolicyagent/opa:0.62.0-istio@sha256:94244de629099cea0a92d2680c982f16756f1e1e9de465db7af46bbc25516f7f