chore: pin actions/setup-node to a full-length commit SHA

Author: tkskto

.github/workflows/lint.yml

@@ -13,7 +13,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4.1.6
       - name: Use node.js 20
-        uses: actions/setup-node@v4.0.3
+        uses: actions/setup-node@a0853c24544627f65ddf259abe73b1d18a591444 # v5.0.0
         with:
           node-version: 20
       - name: Install npm@v10

.github/workflows/test.yml

@@ -13,7 +13,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4.1.6
       - name: Use node.js 20
-        uses: actions/setup-node@v4.0.3
+        uses: actions/setup-node@a0853c24544627f65ddf259abe73b1d18a591444 # v5.0.0
         with:
           node-version: 20
       - name: Install npm@v10