.github: switch to windows-latest

Author: xqms

.github/workflows/main.yml

@@ -33,15 +33,15 @@ jobs:
           graphicscache.pdf
           graphicscache.sty
   windows_miktex:
-    runs-on: windows-2019
+    runs-on: windows-latest
     name: Test on Windows using MikTeX
     steps:
     - name: Checkout
       uses: actions/checkout@v3
     - name: Compile and test
       uses: ./.github/actions/windows
   windows_texlive:
-    runs-on: windows-2019
+    runs-on: windows-latest
     name: Test on Windows using TeX Live
     steps:
     - name: Checkout