both wrappers httr2::jwt_encode_sig and httr2::jwt_encode_hmac call jose::jwt_encode_sig

[denskh]

This causing error when trying to use jwt_encode_hmac:

httr2/R/jwt.R

Line 70 in 023c535

jose::jwt_encode_sig(claim, secret, size = size, header = header)

[hadley]

Ooops. Do you want to do a PR to fix this?