Update build.yml

Author: sabianroberts

.github/workflows/build.yml

@@ -32,7 +32,7 @@ jobs:
 
   build-linux-gcc:
     name: build-linux (gcc-${{ matrix.gcc-ver }}, ${{ matrix.configuration }})
-    runs-on: ubuntu
+    runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
@@ -90,4 +90,4 @@ jobs:
         run: cmake -G Ninja -DCMAKE_BUILD_TYPE=${{ matrix.configuration }} -B build
       - name: Build
         working-directory: build
-        run: ninja
+        run: ninja