Update actions/cache action to v3 (#3277)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

.github/workflows/docs.yml

@@ -12,7 +12,7 @@ jobs:
       - uses: actions/setup-node@v3
         with:
           node-version: 12.x
-      - uses: actions/cache@v2
+      - uses: actions/cache@v3
         id: cache
         with:
           path: '**/node_modules'

.github/workflows/test.yml

@@ -16,7 +16,7 @@ jobs:
       - uses: actions/setup-node@v3
         with:
           node-version: 12.x
-      - uses: actions/cache@v2
+      - uses: actions/cache@v3
         id: cache
         with:
           path: '**/node_modules'
@@ -42,7 +42,7 @@ jobs:
       - uses: actions/setup-node@v3
         with:
           node-version: 12.x
-      - uses: actions/cache@v2
+      - uses: actions/cache@v3
         id: cache
         with:
           path: '**/node_modules'
@@ -62,7 +62,7 @@ jobs:
       - uses: actions/setup-node@v3
         with:
           node-version: 12.x
-      - uses: actions/cache@v2
+      - uses: actions/cache@v3
         id: cache
         with:
           path: '**/node_modules'