Update dependency firebase/php-jwt to v6.7.0

This MR contains the following updates:

Package	Type	Update	Change
firebase/php-jwt	require	minor	6.6.0 -> 6.7.0

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Release Notes

firebase/php-jwt

v6.7.0

Compare Source

Features

• add ed25519 support to JWK (public keys) (#​452) (e53979a)

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