Bump actions/checkout from 3 to 4 (#13)

Author: MSP-Greg

.github/workflows/mswin.yml

@@ -20,7 +20,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1

.github/workflows/windows-build-tools.yml

@@ -19,7 +19,7 @@ jobs:
       fail-fast: false
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Copy msys2 files to temp dir
         run:  |
@@ -58,7 +58,7 @@ jobs:
           - { gcc: ucrt64-3.0 , ruby: ucrt  }
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1