Update dependency firebase/php-jwt to v6.5.0

This MR contains the following updates:

Package	Type	Update	Change
firebase/php-jwt	require	minor	6.4.0 -> 6.5.0

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Release Notes

firebase/php-jwt

v6.5.0

Compare Source

Bug Fixes

• allow KID of '0' (#​505) (9dc46a9)

Miscellaneous Chores

• drop support for PHP 7.3 (#​495)

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