[zstd] Disable stubtest (#16057)

zstd 1.5.7.2 has been yanked, which is why stubtest
currently fails.

Author: donbarbos

stubs/zstd/METADATA.toml

@@ -1,2 +1,7 @@
 version = "~=1.5.7.3"
 upstream-repository = "https://github.com/sergey-dryabzhinsky/python-zstd"
+
+[tool.stubtest]
+# Temporarily disabled until release 1.5.7.3 returns to PyPI
+# https://github.com/python/typeshed/pull/16057
+skip = true