Bump DG actions, cleanu up root, bump deps (#524)

.github/workflows/pr-any.yml

@@ -9,7 +9,7 @@ jobs:
     name: ${{ matrix.step }}
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
     - name: ${{ matrix.step }}
       run: |
         yarn install --immutable | grep -v 'YN0013'

.github/workflows/push-master.yml

@@ -13,7 +13,7 @@ jobs:
     if: "! startsWith(github.event.head_commit.message, '[CI Skip]') && github.repository == 'polkadot-js/extension'"
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
       with:
         token: ${{ secrets.GH_PAT }}
     - name: ${{ matrix.step }}