Update Scheduled Vulnerability Check and Dependabot configuration (#2879)

Author: brfrn169

.github/dependabot.yml

@@ -74,13 +74,3 @@ updates:
     directory: "/"
     schedule:
       interval: "weekly"
-
-  - package-ecosystem: "github-actions"
-    target-branch: "3.12"
-    groups:
-      actions on branch 3.12:
-        patterns:
-          - "*"
-    directory: "/"
-    schedule:
-      interval: "weekly"

.github/workflows/scheduled-vuln-check.yaml

@@ -16,15 +16,6 @@ jobs:
       CR_PAT: ${{ secrets.CR_PAT }}
       SLACK_SECURITY_WEBHOOK_URL: ${{ secrets.SLACK_SECURITY_WEBHOOK_URL }}
 
-  call-vuln-check-for-v3_12:
-    uses: ./.github/workflows/vuln-check.yaml
-    with:
-      target-ref: v3.12
-      find-latest-release: true
-    secrets:
-      CR_PAT: ${{ secrets.CR_PAT }}
-      SLACK_SECURITY_WEBHOOK_URL: ${{ secrets.SLACK_SECURITY_WEBHOOK_URL }}
-
   call-vuln-check-for-v3_13:
     uses: ./.github/workflows/vuln-check.yaml
     with: