Merge branch 'update-mattermost-tag-7.4.0-bb.0' into 'master'

Updated mattermost to 7.4.0

Closes platform-one/big-bang/apps/collaboration-tools/mattermost#57

See merge request platform-one/big-bang/bigbang!2211

chart/values.yaml

@@ -1248,7 +1248,7 @@ addons:
     git:
       repo: https://repo1.dso.mil/platform-one/big-bang/apps/collaboration-tools/mattermost.git
       path: "./chart"
-      tag: "7.3.0-bb.1"
+      tag: "7.4.0-bb.0"
 
     # -- Flux reconciliation overrides specifically for the Mattermost Package
     flux: {}

tests/test-values.yaml

@@ -1213,6 +1213,7 @@ addons:
       bbtests:
         enabled: true
         cypress:
+          image: registry.dso.mil/platform-one/big-bang/pipeline-templates/pipeline-templates/cypress/kubectl:8.3.1
           envs:
             cypress_url: https://chat.bigbang.dev