chore(deps): update magefile/mage-action action to v4 (#863)

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Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/buildtest.yaml

@@ -60,7 +60,7 @@ jobs:
           go mod tidy
 
       - name: Mage Build
-        uses: magefile/mage-action@v3
+        uses: magefile/mage-action@v4
         with:
           version: latest
           args: build
@@ -72,7 +72,7 @@ jobs:
           install-go: false
 
       - name: Mage Test
-        uses: magefile/mage-action@v3
+        uses: magefile/mage-action@v4
         with:
           version: latest
           args: test