Fix more pylint warnings

scripts/wk/graph.py

@@ -64,7 +64,7 @@ def export_io_graph(disk, log_dir, read_rates):
   y_range = (math.ceil(max_rate/100)*100) + 200
 
   # Save plot data to file for Gnuplot
-  with open(plot_data, 'w') as _f:
+  with open(plot_data, 'w', encoding='utf-8') as _f:
     for i, rate in enumerate(read_rates):
       percent = (i+1) / len(read_rates) * 100
       rate = int(rate / (1024**2))

scripts/wk/hw/diags.py

@@ -414,7 +414,7 @@ class State():
       exe.run_program(cmd, check=False, shell=True)
 
     # osTicket
-    with open(f'{debug_dir}/osTicket.report', 'a') as _f:
+    with open(f'{debug_dir}/osTicket.report', 'a', encoding='utf-8') as _f:
       _f.write('\n'.join(debug.generate_object_report(self.ost)))
 
     # SMC

scripts/wk/repairs/win.py

@@ -1102,7 +1102,7 @@ def run_emsisoft_cmd_scan():
   whitelist_path = log_path.with_suffix('.wl')
 
   # Create whitelist
-  whitelist_path.write_text(WHITELIST)
+  whitelist_path.write_text(WHITELIST, encoding='utf-8')
 
   # Run Scan
   cmd = [