fix syntax error

Author: Fuseteam

ubports-qa

@@ -91,7 +91,7 @@ def apt_upgrade():
     except subprocess.CalledProcessError:
         LOG.error("Failed to run 'apt full-upgrade'. See the output above for details.")
 
-def apt_install(repository_name)
+def apt_install(repository_name):
     LOG.debug("upgrading package")
     try:
         subprocess.run(["pkginstall", package], check=True)