chore(deps): update actions/setup-node action to v6

Author: renovate[bot]

.github/workflows/build.yml

@@ -11,7 +11,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Use Node.js
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v6
         with:
           node-version: '15.2.0'
       - run: yarn --frozen-lockfile

.github/workflows/scip.yml

@@ -7,7 +7,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Setup Node.js
-        uses: actions/setup-node@v2
+        uses: actions/setup-node@v6
         with:
           node-version: 16
       - run: yarn global add @sourcegraph/scip-typescript @sourcegraph/src