Update Keycloak dependencies and add missing charts

This commit updates the Keycloak Helm chart dependencies to
include the latest version of PostgreSQL (16.7.24) and adds the
common chart (version 2.31.3) as new files. The updates were
necessary to ensure compatibility with the latest features
and security patches provided by both dependencies.

The `Chart.lock` file was modified to reflect the version
increment for PostgreSQL and includes a new digest and
generated timestamp. The addition of the `.tgz` files for
both charts ensures that they are packaged and available for
deployment without fetching directly from the remote
repository.

There are no breaking changes introduced with these updates;
the changes primarily enhance the stability and security of
the Keycloak deployment.

charts/keycloak/Chart.lock

@@ -1,9 +1,9 @@
 dependencies:
 - name: postgresql
   repository: oci://registry-1.docker.io/bitnamicharts
-  version: 16.7.21
+  version: 16.7.24
 - name: common
   repository: oci://registry-1.docker.io/bitnamicharts
   version: 2.31.3
-digest: sha256:cc4b0618c5eb9e447c5538ba043869a7cbd6548d32768d8f63267fa27fdc5459
-generated: "2025-08-07T14:44:22.967095866Z"
+digest: sha256:d8069a70d0f19ff31989b0755d92997aae49301596058d679b002f678315ab9e
+generated: "2025-08-10T11:18:09.390206634+02:00"