Remove disable=broad-except

The pylint warning W0703:broad-except was raised only
when six was used and python 2 was still supported.

The warning is no longer raised, the exceptions are
handled/raised correctly and the disabling can be removed.

Signed-off-by: Teodora Sechkova <[email protected]>

Author: sechkova

tuf/api/serialization/json.py

@@ -36,7 +36,7 @@ def deserialize(self, raw_data: bytes) -> Metadata:
             json_dict = json.loads(raw_data.decode("utf-8"))
             metadata_obj = Metadata.from_dict(json_dict)
 
-        except Exception as e:  # pylint: disable=broad-except
+        except Exception as e:
             raise DeserializationError from e
 
         return metadata_obj
@@ -66,7 +66,7 @@ def serialize(self, metadata_obj: Metadata) -> bytes:
                 sort_keys=True,
             ).encode("utf-8")
 
-        except Exception as e:  # pylint: disable=broad-except
+        except Exception as e:
             raise SerializationError from e
 
         return json_bytes
@@ -83,7 +83,7 @@ def serialize(self, signed_obj: Signed) -> bytes:
             signed_dict = signed_obj.to_dict()
             canonical_bytes = encode_canonical(signed_dict).encode("utf-8")
 
-        except Exception as e:  # pylint: disable=broad-except
+        except Exception as e:
             raise SerializationError from e
 
         return canonical_bytes