Fix actions casing

Author: silvanocerza

.github/workflows/link-validation.yml

@@ -17,7 +17,7 @@ jobs:
           fetch-depth: 1
 
       - name: Install Taskfile
-        uses: Arduino/actions/setup-taskfile@master
+        uses: arduino/actions/setup-taskfile@master
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
           version: 3.x

.github/workflows/verify-formatting.yml

@@ -25,7 +25,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Install Taskfile
-        uses: Arduino/actions/setup-taskfile@master
+        uses: arduino/actions/setup-taskfile@master
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
           version: 3.x