Fix job names which are required to follow an identifer syntax.

.github/workflows/tests.yml

@@ -12,7 +12,7 @@ on:
 permissions: read-all
 
 jobs:
-  tests for linux:
+  linux_tests:
     runs-on: ubuntu-latest
     strategy:
       fail-fast: true
@@ -28,15 +28,15 @@ jobs:
       - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
       - name: ${{ matrix.name }}
         run: scripts/verify_tests_on_master.sh --shards 3 --shard-index ${{ matrix.shard-index }}
-  tests for skp_generator:
+  skp_generator_tests:
     runs-on: ubuntu-latest
     strategy:
       fail-fast: true
     steps:
       - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
       - name: skp_generator 
         run: (cd skp_generator && ./build.sh)
-  tests for windows:
+  windows_tests:
     runs-on: windows-latest
     strategy:
       fail-fast: true
@@ -56,7 +56,7 @@ jobs:
       - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
       - name: ${{ matrix.name }}
         run: scripts\verify_tests_on_master.bat --shards 5 --shard-index ${{ matrix.shard-index }}
-  tests for macos:
+  macos_tests:
     runs-on: macos-latest
     strategy:
       fail-fast: true