CI: disable vermin check for deprecated hash (#19612)

Spack has a fallback for hash checking with m55sums that may not be
supported in earlier versions of Python 3.x. The comments in the
Spack code acknowledge that this is best effort and may fail, but
recent vermin checks (running as part of our CI) reject this. This
disables vermin checks for that fallback.

lib/spack/spack/util/crypto.py

@@ -45,7 +45,8 @@ def __call__(self, disable_alert=False):
                           " supported in future Spack releases."
                           .format(self.hash_alg))
         if self.disable_security_check:
-            return hashlib.new(self.hash_alg, usedforsecurity=False)
+            return hashlib.new(  # novermin
+                self.hash_alg, usedforsecurity=False)
         else:
             return hashlib.new(self.hash_alg)