fix: direct .format() usage in exception messages

src/vcspull/_internal/config_reader.py:49:39: EM102 [*] Exception must not use an f-string literal, assign to variable first
src/vcspull/_internal/config_reader.py:112:39: EM102 [*] Exception must not use an f-string literal, assign to variable first
src/vcspull/_internal/config_reader.py:187:39: EM102 [*] Exception must not use an f-string literal, assign to variable first
Found 3 errors.

Author: tony

src/vcspull/_internal/config_reader.py

@@ -46,7 +46,8 @@ def _load(format: "FormatLiteral", content: str) -> dict[str, t.Any]:
         elif format == "json":
             return t.cast(dict[str, t.Any], json.loads(content))
         else:
-            raise NotImplementedError(f"{format} not supported in configuration")
+            msg = f"{format} not supported in configuration"
+            raise NotImplementedError(msg)
 
     @classmethod
     def load(cls, format: "FormatLiteral", content: str) -> "ConfigReader":
@@ -109,7 +110,8 @@ def _from_file(cls, path: pathlib.Path) -> dict[str, t.Any]:
         elif path.suffix == ".json":
             format = "json"
         else:
-            raise NotImplementedError(f"{path.suffix} not supported in {path}")
+            msg = f"{path.suffix} not supported in {path}"
+            raise NotImplementedError(msg)
 
         return cls._load(
             format=format,
@@ -184,7 +186,8 @@ def _dump(
                 indent=2,
             )
         else:
-            raise NotImplementedError(f"{format} not supported in config")
+            msg = f"{format} not supported in config"
+            raise NotImplementedError(msg)
 
     def dump(self, format: "FormatLiteral", indent: int = 2, **kwargs: t.Any) -> str:
         r"""Dump via ConfigReader instance.