chore(deps): update openpolicyagent/opa docker tag to v1.15.1

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

dependencies.Dockerfile

@@ -6,7 +6,7 @@
 FROM otel/weaver:v0.13.2 AS weaver
 
 # OPA is used to test policies enforced by weaver.
-FROM openpolicyagent/opa:1.2.0 AS opa
+FROM openpolicyagent/opa:1.15.1 AS opa
 
 # Semconv gen is used for backwards compatibility checks.
 # TODO(jsuereth): Remove this when no longer used.