fix(gatsby): Lock yarn version to previous for tests (#34905)

Co-authored-by: Michal Piechowiak <[email protected]>

Author: imjoshin

.circleci/config.yml

@@ -350,6 +350,9 @@ jobs:
       - run: # Quick upgrade to the v2 (any version, we just need the real set version)
           command: yarn policies set-version berry
           working_directory: /tmp/e2e-tests/gatsby-pnp
+      - run: # TODO: remove pinned version
+          command: yarn set version 3.1.1
+          working_directory: /tmp/e2e-tests/gatsby-pnp
       - run: # Explicitly set nodeLinker to avoid Yarn selecting node_modules due to the Yarn 1.x lockfile
           command: yarn config set nodeLinker pnp
           working_directory: /tmp/e2e-tests/gatsby-pnp