fix(workflows): only accept schema_version 1.0 so the error message is accurate

The check also accepted "1" while the error said Expected '1.0'.
Unquoted YAML 1.0 still works via str(); plain 1 is now rejected with
the message that matches.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: marcelsafin

src/specify_cli/workflows/engine.py

@@ -131,7 +131,7 @@ def validate_workflow(definition: WorkflowDefinition) -> list[str]:
     # -- Schema version ---------------------------------------------------
     # str() so an unquoted ``schema_version: 1.0`` (YAML float) is accepted —
     # rejecting it would print "Unsupported schema_version 1.0. Expected '1.0'."
-    if str(definition.schema_version) not in ("1.0", "1"):
+    if str(definition.schema_version) != "1.0":
         errors.append(
             f"Unsupported schema_version {definition.schema_version!r}. "
             f"Expected '1.0'."