use format instead of f-string

nf_core/pipelines/schema.py

@@ -427,8 +427,9 @@ def validate_schema_title_description(self, schema=None):
             if "title" not in self.schema:
                 raise AssertionError("Schema missing top-level `title` attribute")
             # Validate that id, title and description match the pipeline manifest
-            pipeline_name = self.pipeline_manifest["name"].strip("\"'")
-            id_attr = f"https://raw.githubusercontent.com/{pipeline_name}/main/nextflow_schema.json"
+            id_attr = "https://raw.githubusercontent.com/{}/main/nextflow_schema.json".format(
+                self.pipeline_manifest["name"].strip("\"'")
+            )
             if self.schema["$id"] not in [id_attr, id_attr.replace("/main/", "/master/")]:
                 raise AssertionError(
                     f"Schema `$id` should be `{id_attr}` or {id_attr.replace("/main/", "/master/")}. \n Found `{self.schema['$id']}`"