Fix format of keyring/boklm.gpg

In #40871 (closed) I incorrectly set keyring/boklm.gpg in format GPG keybox database version 1, instead of PGP/GPG key public ring (v4). Which make it not work with some version of gpg.

This can be fixed with:

 gpg --no-default-keyring --keyring ./keyring/boklm.gpg --export > ./keyring/boklm-2.gpg
 mv ./keyring/boklm-2.gpg ./keyring/boklm.gpg

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