Change runner for linting to ubuntu only

Signed-off-by: Trivernis <trivernis@protonmail.com>

.github/workflows/lint.yml

@@ -12,11 +12,7 @@ env:
 jobs:
 
   lint:
-    strategy:
-      fail-fast: false
-      matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
-    runs-on: ${{ matrix.os }}
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2