Update gcr.io/cloud-sql-connectors/cloud-sql-proxy Docker tag to v2.15.0

Signed-off-by: red-hat-konflux <126015336+red-hat-konflux[bot]@users.noreply.github.com>

Dockerfile.deps

@@ -1,6 +1,6 @@
 # This Dockerfile simply serves as a trigger for dependabot to notify when a new upstream release of a component is available
 #
 # !!! READ AND ACT ON THIS !!! If dependabot proposes an update to the container listed below, you should also update the value listed in '.ko.yaml' and cut a new release of scaffolding
-FROM gcr.io/cloud-sql-connectors/cloud-sql-proxy:2.14.0-alpine as cloud-sql-proxy
+FROM gcr.io/cloud-sql-connectors/cloud-sql-proxy:2.15.0-alpine as cloud-sql-proxy
 ENV FOO=BAR
 #