[2023.1] Ensure get_requests_for_local_unit doesn't fail on incomplete relation

This is a rebuild/make sync for charms to pickup the fix in charmhelpers to fix
any inadvertant accesses of ['ca'] in the relation data before it is available
from vault in the certificates relation.  Fix in charmhelpers is in [1].

[1] https://github.com/juju/charm-helpers/pull/825
Closes-Bug: #2028683

Change-Id: I0e7e2e67109f39a507b69de9d4f1e6abccf32f58

charmcraft.yaml

@@ -4,6 +4,8 @@ parts:
   charm:
     plugin: reactive
     reactive-charm-build-arguments:
+      - --use-lock-file-branches
+      - --verbose
       - --binary-wheels-from-source
     build-packages:
       - tox

rebuild

@@ -2,4 +2,4 @@
 # when dependencies of the charm change,
 # but nothing in the charm needs to.
 # simply change the uuid to something new
-53e7e788-1178-11ec-b98d-03bb3d032abd
+53aeadd0-3b77-11ee-848f-d7f283255cc5

src/build.lock

@@ -782,7 +782,7 @@
       "type": "python_module",
       "package": "PyYAML",
       "vcs": null,
-      "version": "6.0"
+      "version": "6.0.1"
     },
     {
       "type": "python_module",
@@ -818,7 +818,7 @@
       "type": "python_module",
       "package": "Cython",
       "vcs": null,
-      "version": "0.29.34"
+      "version": "0.29.36"
     },
     {
       "type": "python_module",