Show backend and its version

Author: charsbar

.github/workflows/testsuite.yml

@@ -31,7 +31,7 @@ jobs:
         run: prove -b xt
 
   linux:
-    name: "linux ${{ matrix.perl-version }}"
+    name: "linux ${{ matrix.perl-version }} ${{ matrix.backend }} ${{ matrix.backend-version }}"
     needs: [ubuntu]
     env:
       PERL_USE_UNSAFE_INC: 0