chore: pin jdx/mise-action to full commit SHA

Co-Authored-By: Claude <claude@anthropic.com>

Author: 0x46616c6b

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Install mise
-        uses: jdx/mise-action@v2
+        uses: jdx/mise-action@c37c93293d6b742fc901e1406b8f764f6fb19dac # v2
 
       - name: Run shellcheck
         run: mise run lint
@@ -31,7 +31,7 @@ jobs:
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Install mise
-        uses: jdx/mise-action@v2
+        uses: jdx/mise-action@c37c93293d6b742fc901e1406b8f764f6fb19dac # v2
 
       - name: Run tests
         run: mise run test