Fixes EPP image tag to follow RC semver guidelines

Signed-off-by: Daneyon Hansen <[email protected]>

Author: danehans

pkg/manifests/ext_proc.yaml

@@ -71,7 +71,7 @@ spec:
     spec:
       containers:
       - name: inference-gateway-ext-proc
-        image: us-central1-docker.pkg.dev/k8s-staging-images/gateway-api-inference-extension/epp:v0.1.0-rc1
+        image: us-central1-docker.pkg.dev/k8s-staging-images/gateway-api-inference-extension/epp:v0.1.0-rc.1
         imagePullPolicy: IfNotPresent
         args:
         - -poolName