Updated CI actions, as they just keep failing.

Author: enblacar

.github/workflows/R-CMD-check.yaml

@@ -4,7 +4,6 @@ on:
   push:
     branches: [main, master]
   pull_request:
-    branches: [main, master]
 
 name: R-CMD-check.yaml
 
@@ -34,10 +33,6 @@ jobs:
       - uses: actions/checkout@v4
 
       - uses: r-lib/actions/setup-pandoc@v2
-      
-      - name: Install libglpk40
-        if: ${{ matrix.config.os == 'ubuntu-latest' }}
-        run: sudo apt-get install -y libglpk40
 
       - uses: r-lib/actions/setup-r@v2
         with: