Include changes in pre-commit update pull request

Author: zachborboa

.github/workflows/pre-commit-auto-update.yml

@@ -14,13 +14,25 @@ jobs:
 
       - name: Update dependencies
         run: |
+          set -x
           python -m pip install --upgrade pip
           pip install pre-commit
           pre-commit autoupdate
 
+      - name: Gather changes
+        id: gather-changes
+        run: |
+          git diff --color
+          changes="$(git diff)"
+          echo "changes=${changes}" >> $GITHUB_OUTPUT
+
       - name: Create pull request
         uses: peter-evans/create-pull-request@v5
         with:
           commit-message: Update pre-commit dependencies
           labels: cleanup-no-release-required, dependencies, github_actions
           title: Update pre-commit dependencies
+          body: |
+            ```diff
+            ${{ steps.gather-changes.outputs.changes }}
+            ```