chore(🐙): add update depot tool step (#3208)

Author: wcandillon

.github/workflows/build-skia-graphite.yml

@@ -27,6 +27,10 @@ jobs:
           download_skia: 'false'
           github_token: ${{ secrets.GITHUB_TOKEN }}
 
+      - name: Update depot_tools
+        working-directory: ./externals/depot_tools
+        run: ./update_depot_tools
+
       - name: Apply Dawn patch
         run: |
           DAWN_GNI_FILE="./externals/skia/build_overrides/dawn.gni"
@@ -125,4 +129,4 @@ jobs:
           name: skia-graphite-headers
           path: |
             ./packages/skia/cpp/dawn/include/
-            ./packages/skia/cpp/skia/src/gpu/graphite/
+            ./packages/skia/cpp/skia/src/gpu/graphite/