fix: add mcr to spellcheck dictionary

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: chris-rock

.github/actions/spelling/expect.txt

@@ -8,6 +8,7 @@ eksctl
 fullname
 iamidentitymapping
 irsa
+mcr
 oidc
 openssl
 psat