package/wolfssl: bump to version 4.2.0
WolfSSL 4.2.0 has been released, it includes new features and fixes. The
full changelog is available here [1].
Update the wolfssl package to stable version 4.2.0 and the
corresponding hash file.
[1] https://www.wolfssl.com/docs/wolfssl-changelog/
Signed-off-by: Julien Grossholtz <julien.grossholtz@openest.io>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>