fix(manifest): Update depot_tools installation to preserve file attributes as a fix

com.aseprite.Aseprite.yaml

@@ -45,8 +45,9 @@ modules:
       # Install it into /app/depot_tools within the build environment.
       # The source '.' is now /sources/depot_tools
       - install -d /app/depot_tools
-      - cp -r ./* /app/depot_tools/
-      - chmod -R u+rX /app/depot_tools
+      - cp -a ./* /app/depot_tools/ # -a preserves symlinks, ownership (if possible), and modes
+      # Make files/dirs owner-writable, and all-readable/all-executable(X)
+      - chmod -R u+rwX,go+rX /app/depot_tools
     sources:
       # Use the directory copied into the Docker image
       - type: dir