DEV: Update CI workflows

DEV: Update CI workflows

diff --git a/.github/workflows/plugin-tests.yml b/.github/workflows/plugin-tests.yml
index d6cb3e5..80a05e9 100644
--- a/.github/workflows/plugin-tests.yml
+++ b/.github/workflows/plugin-tests.yml
@@ -108,7 +108,7 @@ jobs:
           bundle config without 'development'
 
       - name: Bundler cache
-        uses: actions/cache@v1
+        uses: actions/cache@v2
         id: bundler-cache
         with:
           path: vendor/bundle
@@ -124,7 +124,7 @@ jobs:
         run: echo "::set-output name=dir::$(yarn cache dir)"
 
       - name: Yarn cache
-        uses: actions/cache@v1
+        uses: actions/cache@v2
         id: yarn-cache
         with:
           path: ${{ steps.yarn-cache-dir.outputs.dir }}

GitHub sha: 69a08f5e