Update actions/cache to v4.

Author: mijovic

.github/workflows/build.yml

@@ -21,7 +21,7 @@ jobs:
         with:
           node-version: '16'
       - uses: actions/checkout@v1
-      - uses: actions/cache@v2
+      - uses: actions/cache@v4
         with:
           path: node_modules
           key: ${{ runner.os }}-${{ hashFiles('yarn.lock') }}
@@ -42,7 +42,7 @@ jobs:
         with:
           node-version: '16'
       - uses: actions/checkout@v1
-      - uses: actions/cache@v2
+      - uses: actions/cache@v4
         with:
           path: node_modules
           key: ${{ runner.os }}-${{ hashFiles('yarn.lock') }}
@@ -57,7 +57,7 @@ jobs:
         with:
           node-version: '16'
       - uses: actions/checkout@v1
-      - uses: actions/cache@v2
+      - uses: actions/cache@v4
         with:
           path: node_modules
           key: ${{ runner.os }}-${{ hashFiles('yarn.lock') }}
@@ -71,7 +71,7 @@ jobs:
         with:
           node-version: '16'
       - uses: actions/checkout@v1
-      - uses: actions/cache@v2
+      - uses: actions/cache@v4
         with:
           path: node_modules
           key: ${{ runner.os }}-${{ hashFiles('yarn.lock') }}
@@ -80,7 +80,7 @@ jobs:
       - run: yarn compile
 
       - run: FORCE_COLOR=1 yarn coverage
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v4
         with:
           name: solidity-coverage
           path: |