Add missing comma

Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>

Author: clin1234

Lib/test/test_mimetypes.py

@@ -247,7 +247,7 @@ def check_extensions():
                 ("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", ".xlsx"),
                 ("application/vnd.openxmlformats-officedocument.wordprocessingml.document", ".docx"),
                 ("application/vnd.rar", ".rar"),
-                ("application/vnd.sqlite3", ".sqlite3")
+                ("application/vnd.sqlite3", ".sqlite3"),
                 ("application/x-7z-compressed", ".7z"),
                 ("application/x-debian-package", ".deb"),
                 ("application/x-httpd-php", ".php"),