Update patchmon to 2.1.3

Chart rewrite for the 2.x single-server architecture: one stateless
server deployment (frontend embedded, /api served by the same process),
no PVC, single service and ingress path, optional guacd sidecar
(disabled by default), 2.x env vocabulary (TRUST_PROXY, readonly role),
probes send the public hostname as Host header.

Fixes #29: all three reported spots (PVC storageClass guard, RWX assets
PVC, frontend nginx 'backend' hostname) are removed by this rewrite.

ci/patchmon/test-values.yaml

@@ -7,13 +7,3 @@ secrets:
 ingress:
   clusterIssuer: ci
   domain: patchmon.ci.local
-
-patchmon:
-  storage:
-    # Point the RWX assets PVC at the fixture StorageClass so the pre-created
-    # world-writable hostPath PV is used (local-path cannot provision RWX, and
-    # the non-root backend must write its assets dir at boot). Note: the PVC
-    # template guards on .storage.storageClass but renders .storage.class,
-    # so both keys must be set.
-    storageClass: ci-static
-    class: ci-static