ci: disable persisted git credentials for improved security

Author: G-Rath

.github/workflows/rubocop.yml

@@ -13,6 +13,8 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
+        with:
+          persist-credentials: false
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}

.github/workflows/ruby.yml

@@ -18,6 +18,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
+        with:
+          persist-credentials: false
       - uses: actions/setup-node@v3
       - name: Save root node_modules to cache
         uses: actions/cache@v3
@@ -67,6 +69,8 @@ jobs:
       MT_KWARGS_HACK: 1
     steps:
     - uses: actions/checkout@v3
+      with:
+        persist-credentials: false
     - uses: actions/setup-node@v3
     - run: npm -g install yalc
     - run: yalc publish