(CONT-903) Address cache@v2 deprecation warnings

cache@v2 deprecation warnings were missed in the previous PR to remove deprecation warnings in this repo. This PR addresses these remaining warnings

Author: GSPatton

.github/workflows/ci.yml

@@ -39,7 +39,7 @@ jobs:
           ruby-version: "2.7"
 
       - name: Cache gems
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: vendor/gems
           key: ${{ runner.os }}-pr-${{ hashFiles('**/Gemfile') }}

.github/workflows/nightly.yml

@@ -38,7 +38,7 @@ jobs:
           ruby-version: "2.7"
 
       - name: Cache gems
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: vendor/gems
           key: ${{ runner.os }}-pr-${{ hashFiles('**/Gemfile') }}