ParameterValue enum with fields does not follow serde rename

[spoorn]

Enum fields like allow_reserved in ParameterValue is not following the serde rename:

okapi/okapi/src/openapi3.rs

Lines 276 to 298 in d3bc658

	// maybe this should just been inlined into Parameter as fields?
	#[derive(Debug, Clone, PartialEq, Deserialize, Serialize)]
	#[cfg_attr(feature = "impl_json_schema", derive(JsonSchema))]
	#[serde(untagged, rename_all = "camelCase")]
	#[allow(clippy::large_enum_variant)] // Removing this requires breaking changes to API.
	pub enum ParameterValue {
	Schema {
	#[serde(default, skip_serializing_if = "Option::is_none")]
	style: Option<ParameterStyle>,
	#[serde(default, skip_serializing_if = "Option::is_none")]
	explode: Option<bool>,
	#[serde(default, skip_serializing_if = "is_false")]
	allow_reserved: bool,
	schema: SchemaObject,
	#[serde(default, skip_serializing_if = "Option::is_none")]
	example: Option<Value>,
	#[serde(default, skip_serializing_if = "Option::is_none")]
	examples: Option<Map<String, Example>>,
	},
	Content {
	content: Map<String, MediaType>,
	},
	}

It needs rename_all_fields specified to work on the enum fields: https://serde.rs/container-attrs.html

This causes it to fail OpenAPI spec validation