Update firebase/php-jwt requirement from ^5.5 to ^6.3

[dependabot[bot]]

Updates the requirements on firebase/php-jwt to permit the latest version.

Release notes

Sourced from firebase/php-jwt's releases.

v6.3.0

Features

• Added ES256 support to JWK parsing (#399)

Bug Fixes

• Fixed potential caching error in CachedKeySet by caching jwks as strings (#435)

Commits

• 018dfc4 chore: prepare v6.3.0 (#441)
• 608668e chore: update changelog for v6.2.0 (#434)
• 1494082 chore: misc cleanup (#439)
• 607dcd4 fix: cache jwks as string in CachedKeySet (#435)
• c68f2a7 chore: fix styles and phpstan (#440)
• 64ed2e5 feat: Add ES256 support to JWK (#399)
• d28e6df feat: add defaultAlg param (#426)
• 2308363 feat: add cached keyset (#397)
• 6a6025b chore: add cs config, fix git-attributes, removed unused entrypoint.sh (#424)
• 0ac5041 chore: styles for short array and single quotes (#423)
• Additional commits viewable in compare view

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[othercorey]

@dependabot ignore this major version

[dependabot[bot]]

OK, I won't notify you about version 6.x.x again, unless you re-open this PR or update to a 6.x.x release yourself.