Drop use of comprimised action

https://www.stepsecurity.io/blog/harden-runner-detection-tj-actions-changed-files-action-is-compromised

Author: tstellar

.github/workflows/docs.yml

@@ -51,7 +51,7 @@ on:
 jobs:
   check-docs-build:
     name: "Test documentation build"
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-latest
     if: github.repository == 'llvm/llvm-project'
     steps:
       # Don't fetch before checking for file changes to force the file changes
@@ -60,12 +60,12 @@ jobs:
       # a local checkout beforehand.
       - name: Fetch LLVM sources (Push)
         if: ${{ github.event_name == 'push' }}
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        uses: actions/checkout@v4
         with:
           fetch-depth: 1
       - name: Get subprojects that have doc changes
         id: docs-changed-subprojects
-        uses: step-security/changed-files@3dbe17c78367e7d60f00d78ae6781a35be47b4a1 # v45.0.1
+        uses: step-security/changed-files@3dbe17c78367e7d60f00d78ae6781a35be47b4a1
         with:
           files_yaml: |
             llvm:
@@ -98,11 +98,11 @@ jobs:
               - '.github/workflows/docs.yml'
       - name: Fetch LLVM sources (PR)
         if: ${{ github.event_name == 'pull_request' }}
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        uses: actions/checkout@v4
         with:
           fetch-depth: 1
       - name: Setup Python env
-        uses: actions/setup-python@42375524e23c412d93fb67b49958b491fce71c38 # v5.4.0
+        uses: actions/setup-python@v5
         with:
           python-version: '3.11'
           cache: 'pip'
@@ -216,7 +216,7 @@ jobs:
           mkdir built-docs/flang
           cp -r flang-build/docs/* built-docs/flang/
       - name: Upload docs
-        uses: actions/upload-artifact@65c4c4a1ddee5b72f698fdd19549f0f0fb45cf08 # v4.6.0
+        uses: actions/upload-artifact@v4
         with:
           name: docs-output
           path: built-docs/