Automatic detection of "Fixes" should be stricter

In https://github.com/nodejs/node/pull/40613, node-core-utils@1.30.0 incorrectly adds a Fixes: metadata line:

----------------------------------- PR info ------------------------------------
Title      crypto: fix build without scrypt (#40613)
Author     Martin 'JaMa' Jansa <Martin.Jansa@gmail.com> (@shr-project, first-time contributor)
Branch     shr-project:jansa/scrypt -> nodejs:master
Labels     crypto, c++, author ready
Commits    1
 - crypto: fix build without scrypt
Committers 1
 - Martin Jansa <martin.jansa@lge.com>
PR-URL: https://github.com/nodejs/node/pull/40613
Fixes: https://github.com/In
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Voltrex <mohammadkeyvanzade94@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs/node/pull/40613
Fixes: https://github.com/In
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Voltrex <mohammadkeyvanzade94@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
--------------------------------------------------------------------------------

The commit message was:

crypto: fix build without scrypt

* add missing semicolon to fix:
  In file included from ../src/node_crypto.h:47,
                   from ../src/node.cc:46:
  ../src/crypto/crypto_scrypt.h:80:2:
  error: expected ';' after struct definition
     80 | }
        |  ^
        |  ;

  and fix typo in the comment

Signed-off-by: Martin Jansa <martin.jansa@lge.com>

_{(Original post in https://github.com/nodejs/node/pull/40613#issuecomment-966507251.)}

Use PR #40613 and the generated metadata shown in this issue as the reproduction case; trace the node-core-utils entry point that detects Fixes metadata from commit messages. Done means the prose mentioning “fix” no longer produces an incorrect Fixes line while valid Fixes references continue to be detected.