workflows: Update actions/cache to v4

Fixes #71

Author: reedy

.github/workflows/lint.yml

@@ -17,7 +17,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Cache vendor
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: |
             vendor
@@ -34,4 +34,4 @@ jobs:
         run: '[ -e vendor ] || composer install'
 
       - name: Lint
-        run: make lint
+        run: make lint

.github/workflows/test-unit-cov.yml

@@ -17,7 +17,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Cache vendor
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: |
             vendor
@@ -35,4 +35,4 @@ jobs:
         run: '[ -e vendor ] || composer install'
 
       - name: Run Tests With Coverage
-        run: make deps test-coverage && bash <(curl -s https://codecov.io/bash)
+        run: make deps test-coverage && bash <(curl -s https://codecov.io/bash)

.github/workflows/test-unit.yml

@@ -17,7 +17,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Cache vendor
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: |
             vendor
@@ -34,4 +34,4 @@ jobs:
         run: '[ -e vendor ] || composer install'
 
       - name: Run Tests
-        run: make deps test
+        run: make deps test