code style : update remaining files (#1353)

* code style: update string formatting using fstrings

---------

Co-authored-by: Willi Ballenthin <willi.ballenthin@gmail.com>
Co-authored-by: Moritz <mr-tz@users.noreply.github.com>

tests/test_scripts.py

@@ -62,5 +62,5 @@ def test_bulk_process(tmpdir):
 
 def run_program(script_path, args):
     args = [sys.executable] + [script_path] + args
-    print("running: '%s'" % args)
+    print(f"running: '{args}'")
     return subprocess.run(args)