chore(deps): update dependency libressl/portable to v4.2.1

[renovate]

This PR contains the following updates:

Package	Update	Change
libressl/portable	patch	4.2.0 -> 4.2.1

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Release Notes

libressl/portable (libressl/portable)

v4.2.1

Compare Source

Reliability fix

• Ensure the group selected by a TLSv1.3 server for a
  HelloRetryRequest is not one for which the client has
  already sent a key share.
  Thanks to dzwdz for identifying and reporting the issue.

Portable changes

• Add missing files for Windows to the release tarball
  Thanks to Markus Friedl and Tess Gauthier.

Full changelog: https://github.com/libressl/portable/blob/master/ChangeLog

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