Remove stable30 from dependabot

.github/dependabot.yml

@@ -124,28 +124,6 @@ updates:
     - dependency-name: "*"
       update-types: ["version-update:semver-major", "version-update:semver-minor"]
 
-- package-ecosystem: composer
-  target-branch: stable30
-  directories:
-    - "/"
-    - "/build/integration"
-    - "/vendor-bin/cs-fixer"
-    - "/vendor-bin/openapi-extractor"
-    - "/vendor-bin/phpunit"
-    - "/vendor-bin/psalm"
-  schedule:
-    interval: weekly
-    day: saturday
-    time: "04:00"
-    timezone: Europe/Paris
-  labels:
-    - "3. to review"
-    - "feature: dependencies"
-  ignore:
-    # only patch updates on stable branches
-    - dependency-name: "*"
-      update-types: ["version-update:semver-major", "version-update:semver-minor"]
-
 # frontend dependencies
 - package-ecosystem: npm
   target-branch: stable31
@@ -165,22 +143,3 @@ updates:
     # no major updates on stable branches
     - dependency-name: "*"
       update-types: ["version-update:semver-major"]
-
-- package-ecosystem: npm
-  target-branch: stable30
-  directory: "/"
-  schedule:
-    interval: weekly
-    day: saturday
-    time: "04:00"
-    timezone: Europe/Paris
-  open-pull-requests-limit: 20
-  labels:
-    - "3. to review"
-    - "feature: dependencies"
-  # Disable automatic rebasing because without a build CI will likely fail anyway
-  rebase-strategy: "disabled"
-  ignore:
-    # no major updates on stable branches
-    - dependency-name: "*"
-      update-types: ["version-update:semver-major"]