Fix most zizmor issues.

Author: davidlehn

.github/workflows/main.yml

@@ -2,6 +2,8 @@ name: Node.js CI
 
 on: [push]
 
+permissions: {}
+
 jobs:
   lint:
     runs-on: ubuntu-latest
@@ -11,6 +13,8 @@ jobs:
         node-version: [24.x]
     steps:
     - uses: actions/checkout@v6
+      with:
+        persist-credentials: false
     - name: Use Node.js ${{ matrix.node-version }}
       uses: actions/setup-node@v6
       with:
@@ -27,6 +31,8 @@ jobs:
         node-version: [20.x, 22.x, 24.x]
     steps:
     - uses: actions/checkout@v6
+      with:
+        persist-credentials: false
     - name: Use Node.js ${{ matrix.node-version }}
       uses: actions/setup-node@v6
       with:
@@ -43,6 +49,8 @@ jobs:
         node-version: [24.x]
     steps:
     - uses: actions/checkout@v6
+      with:
+        persist-credentials: false
     - name: Use Node.js ${{ matrix.node-version }}
       uses: actions/setup-node@v6
       with:
@@ -59,6 +67,8 @@ jobs:
         node-version: [24.x]
     steps:
     - uses: actions/checkout@v6
+      with:
+        persist-credentials: false
     - name: Use Node.js ${{ matrix.node-version }}
       uses: actions/setup-node@v6
       with: