Allow tj-actions/changed-files to fetch default of 50 (#42874)

.github/workflows/content-lint-markdown.yml

@@ -19,8 +19,11 @@ jobs:
       - name: Check out repo
         uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4.0.0
         with:
-          # Needed to detect changed files
-          fetch-depth: 2
+          # Picking this number is a "best guess". If we make it too large,
+          # the checkout will take potentially unnecessariily long.
+          # This reduces the chance that tj-actions/changed-files has to
+          # fetch deeper history. But if it needs to, it will.
+          fetch-depth: 10
 
       - name: Set up Node and dependencies
         uses: ./.github/actions/node-npm-setup
@@ -29,7 +32,6 @@ jobs:
         id: changed-files
         uses: tj-actions/changed-files@246636f5fa148b5ad8e65ca4c57b18af3123e5f6 # v39.0.1
         with:
-          fetch_depth: 2
           files: |
             content/**
             data/**