Exclude Info.plist files from whitespace checks

These files use TABs for indentation, so the standard check doesn't work
for them (and it doesn't seem worth having a special check just for
them neither, so simply don't check them at all).

.github/workflows/code_checks.yml

@@ -49,6 +49,7 @@ jobs:
                 ':!install-sh' \
                 ':!**/*akefile*' \
                 ':!**/*.pbxproj' \
+                ':!**/Info*.plist*' \
                 ':!**/*.sln' \
                 ':!**/*.vcproj' \
                 ':!**/*.xpm'