operations/files.copy: run linter

Author: EricDriussi

src/pyinfra/operations/files.py

@@ -1266,7 +1266,7 @@ def template(
             template_lines = f.readlines()
 
         template_lines = [line.strip() for line in template_lines]
-        relevant_lines = template_lines[max(line_number - 2, 0): line_number + 1]
+        relevant_lines = template_lines[max(line_number - 2, 0) : line_number + 1]
 
         raise OperationError(
             "Error in template: {0} (L{1}): {2}\n...\n{3}\n...".format(