Update actions/checkout version to 5 in GitHub CI workflows

v4 will stop working soon (on 2026-06-02) as it's based on Node 20.

Author: vadz

.github/workflows/ci.yml

@@ -141,7 +141,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           submodules: 'recursive'
 

.github/workflows/ci_msw.yml

@@ -44,7 +44,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           submodules: 'recursive'
 

.github/workflows/codeql.yml

@@ -26,7 +26,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
 
     - name: Initialize CodeQL
       uses: github/codeql-action/init@v2