fix(ci): fix taplo formatting and skip .cargo dir in workspace check

taplo.toml and deny.toml were using 2-space indent; taplo requires tabs.
check-workspace.py now skips .cargo the same way it skips target/ —
prevents 1000+ registry crates from being flagged as missing from workspace
when GitLab cache restores .cargo into the project directory.

.github/scripts/check-workspace.py

@@ -66,6 +66,8 @@ def get_crates(workspace_dir, exclude_crates) -> dict:
 	for root, _dirs, files in os.walk(workspace_dir):
 		if "target" in root:
 			continue
+		if ".cargo" in os.path.relpath(root, workspace_dir).split(os.sep):
+			continue
 		for file in files:
 			if file != "Cargo.toml":
 				continue