Remove the list of branches for link checker (#3731)

Signed-off-by: Fanit Kolchina <kolchfa@amazon.com>

.github/workflows/link-checker.yml

@@ -5,14 +5,9 @@ on:
     - cron: "30 11 * * *"
 jobs:
   check:
-    strategy:
-      matrix:
-        branch: [main, 2.6, 2.5, 2.4, 2.3, 2.2, 2.1, 2.0, 1.3]
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
-      with:
-        ref: ${{ matrix.branch }}
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: '3.0'