Update *load-artifact action to v4

Author: Philip-Larsen-Donnelly

.github/workflows/dhis2-verify-app.yml

@@ -23,7 +23,7 @@ jobs:
               with:
                   node-version: 12.x
 
-            - uses: actions/cache@v2
+            - uses: actions/cache@v4
               id: yarn-cache # use this to check for `cache-hit` (`steps.yarn-cache.outputs.cache-hit != 'true'`)
               with:
                   path: '**/node_modules'
@@ -43,7 +43,7 @@ jobs:
               with:
                   node-version: 12.x
 
-            - uses: actions/cache@v2
+            - uses: actions/cache@v4
               id: yarn-cache
               with:
                   path: '**/node_modules'
@@ -70,7 +70,7 @@ jobs:
               with:
                   node-version: 12.x
 
-            - uses: actions/cache@v2
+            - uses: actions/cache@v4
               id: yarn-cache
               with:
                   path: '**/node_modules'