Use os.path instead of string formatting

src/xfel_calibrate/calibrate.py

@@ -773,7 +773,7 @@ def concurrent_run(
     return jobid
 
 
-def make_par_table(parms, run_tmp_path):
+def make_par_table(parms, run_tmp_path: str):
     """
     Create a table with input parameters of the notebook
 
@@ -834,7 +834,7 @@ def make_par_table(parms, run_tmp_path):
                         \end{longtable}
                     ''')
 
-    f_name = "{}/InputParameters.rst".format(run_tmp_path)
+    f_name = os.path.join(run_tmp_path, "InputParameters.rst")
     with open(f_name, "w") as finfile:
         finfile.write(textwrap.dedent(tmpl.render(p=col_type, lines=l_parms)))