fix: allow StringParam for vpc_connector typing

Author: HassanBahati

src/firebase_functions/options.py

@@ -1232,8 +1232,8 @@ def set_global_options(
     max_instances: int | Expression[int] | _util.Sentinel | None = None,
     concurrency: int | Expression[int] | _util.Sentinel | None = None,
     cpu: int | _typing.Literal["gcf_gen1"] | _util.Sentinel = "gcf_gen1",
-    vpc_connector: str | None = None,
-    vpc_connector_egress_settings: VpcEgressSetting | None = None,
+    vpc_connector: str | Expression[str] | _util.Sentinel | None = None,
+    vpc_connector_egress_settings: VpcEgressSetting | _util.Sentinel | None = None,
     service_account: str | _util.Sentinel | None = None,
     ingress: IngressSetting | _util.Sentinel | None = None,
     labels: dict[str, str] | None = None,