ci: upgrade ReportGenerator-GitHub-Action from 5.5.10 to 5.5.12 (#624)

Author: adrianhall

.github/workflows/build-library.yml

@@ -97,7 +97,7 @@ jobs:
           --coverage-output-format cobertura
 
       - name: Combine coverage reports
-        uses: danielpalme/ReportGenerator-GitHub-Action@5.5.10
+        uses: danielpalme/ReportGenerator-GitHub-Action@5.5.12
         with:
           reports: "**/*.cobertura.xml"
           assemblyfilters: "-*Test*"