Fix \\ in the wrong place

Signed-off-by: Y. Meyer-Norwood <106889957+norwd@users.noreply.github.com>

.github/workflows/test.yml

@@ -43,7 +43,7 @@ jobs:
           exclude-files: .github${{ contains(runner.temp, '\') && '\\' || '/' }}testing${{ contains(runner.temp, '\') && '\\' || '/' }}bad.yml
           include-files: |
             **${{ contains(runner.temp, '\') && '\\' || '/' }}*.{yaml,yml}
-            .github${{ contains(runner.temp, '\\') && '\' || '/' }}testing${{ contains(runner.temp, '\') && '\\' || '/' }}nonexisting.yml
+            .github${{ contains(runner.temp, '\') && '\\' || '/' }}testing${{ contains(runner.temp, '\') && '\\' || '/' }}nonexisting.yml
 
   test_that_fmtya_should_report_missing_yamlfmt_version:
     if: always()