Bump actions/cache to v2

Author: rsora

.github/workflows/link-validation.yaml

@@ -42,7 +42,7 @@ jobs:
           architecture: "x64"
 
       - name: Cache dependencies
-        uses: actions/cache@v1
+        uses: actions/cache@v2
         with:
           path: ~/.cache/pip
           key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}

.github/workflows/publish-docs.yaml

@@ -70,7 +70,7 @@ jobs:
           architecture: "x64"
 
       - name: Cache dependencies
-        uses: actions/cache@v1
+        uses: actions/cache@v2
         with:
           path: ~/.cache/pip
           key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}

.github/workflows/validate-docs.yaml

@@ -57,7 +57,7 @@ jobs:
           architecture: "x64"
 
       - name: Cache dependencies
-        uses: actions/cache@v1
+        uses: actions/cache@v2
         with:
           path: ~/.cache/pip
           key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}