fix: yarn failures (aws-amplify#12368)

Author: sobolk

.circleci/config.base.yml

@@ -135,7 +135,7 @@ jobs:
       - checkout
       - run: yarn config set registry https://registry.npmjs.org
       - run: yarn config set script-shell $(which bash)
-      - run: yarn install
+      - run: yarn install --network-concurrency 1
       - run:
           name: Build tests
           command: yarn build-tests

package.json

@@ -36,7 +36,7 @@
     "prettier-check": "yarn prettier --check .",
     "prettier-changes": "git diff --name-only --diff-filter MRA dev | xargs yarn prettier --write",
     "prettier-write": "yarn prettier --write .",
-    "production-build": "yarn --frozen-lockfile --cache-folder ~/.cache/yarn && nx run-many --target=build --all",
+    "production-build": "yarn --frozen-lockfile --network-concurrency 1 --cache-folder ~/.cache/yarn && nx run-many --target=build --all",
     "promote-rc": "./scripts/promote-rc.sh",
     "publish-to-verdaccio": "lerna publish --yes --no-commit-hooks --no-push --exact --dist-tag=latest --conventional-commits --no-git-tag-version --no-verify-access",
     "release-rc": "./scripts/release-rc.sh",