chore: update charm pins (#1472)

This is an automated PR to update pins of the external repositories that
the operator framework is tested against

Co-authored-by: github-actions <[email protected]>

Author: prints-charming-bot

.github/workflows/db-charm-tests.yaml

@@ -15,13 +15,13 @@ jobs:
       matrix:
         include:
           - charm-repo: canonical/postgresql-operator
-            commit: 564932c23370b9848b19c4f136673f972050787b  # 2024-11-26T15:33:51Z
+            commit: 4c4b810d0670af3e6c551fa6ea2b9e84a902a46e  # rev529 rev528 2024-11-27T16:35:24Z
           - charm-repo: canonical/postgresql-k8s-operator
-            commit: 97c77472a661d4207c458ba7ef92cbb78baf661b  # rev467 rev466 2024-11-26T10:45:43Z
+            commit: 2c41a8d20d0d51d2980f067894a1ec80e14e1296  # 2024-11-27T19:47:17Z
           - charm-repo: canonical/mysql-operator
-            commit: a235a9918a50832005f66d9925c086a07f22f88e  # rev308 rev307 2024-11-26T14:03:28Z
+            commit: 21d23a26da074727d67f1b68dc3a915ed0252cc8  # 2024-11-27T14:48:18Z
           - charm-repo: canonical/mysql-k8s-operator
-            commit: 30dd0d4a16db7bb61cd511784ad9a162b988efb2  # 2024-11-19T13:36:57Z
+            commit: cf0d7f9dfe88270fc2fdd9989c098cb7006b82fd  # 2024-11-27T14:47:30Z
     steps:
       - name: Checkout the ${{ matrix.charm-repo }} repository
         uses: actions/checkout@v4

.github/workflows/observability-charm-tests.yaml

@@ -16,12 +16,12 @@ jobs:
       matrix:
         include:
           - charm-repo: canonical/alertmanager-k8s-operator
-            commit: c640a9ae31e942522911c1d351b3fea6de5165a8  # 2024-11-25T12:26:55Z
+            commit: ddd6c62cc30689b3d353c714b020cb309e59d00c  # 2024-11-27T09:11:44Z
           - charm-repo: canonical/prometheus-k8s-operator
-            commit: 6d22620a68c388095cde8c76bbf7256447918aec # rev217 2024-11-26T11:12:26Z
+            commit: 0953ac0c87dc8912ed935f9130f21940923461e8 # rev218 2024-11-27T10:35:42Z
             disabled: true # Waiting for an upstream PR: https://github.com/canonical/prometheus-k8s-operator/pull/639
           - charm-repo: canonical/grafana-k8s-operator
-            commit: 5b6e32c7ab1e58c248c30265d2f5c474e2db755d  # rev124 2024-11-26T12:06:49Z
+            commit: e821e40ac134468ece69c68ee9bc117b27c5f600  # 2024-11-27T11:34:26Z
     steps:
       - name: Checkout the ${{ matrix.charm-repo }} repository
         uses: actions/checkout@v4