fix!: generate lib and lock jane-php/open-api-runtime to 7.5

[remarkablemark]

What is the motivation for this pull request?

Generate Braze lib so that normalizers are compatible with the contracts from the latest version of Symfony serializer and lock jane-php/open-api-runtime to 7.5

Fixes #55

What is the current behavior?

PHP Fatal error:  Declaration of Braze\Runtime\Normalizer\ReferenceNormalizer::supportsNormalization($data, $format = null): bool must be compatible with Symfony\Component\Serializer\Normalizer\NormalizerInterface::supportsNormalization(mixed $data, ?string $format = null, array $context = []): bool in /home/runner/work/braze-php/braze-php/lib/Runtime/Normalizer/ReferenceNormalizer.php on line 28

   Whoops\Exception\ErrorException 

  Declaration of Braze\Runtime\Normalizer\ReferenceNormalizer::supportsNormalization($data, $format = null): bool must be compatible with Symfony\Component\Serializer\Normalizer\NormalizerInterface::supportsNormalization(mixed $data, ?string $format = null, array $context = []): bool

PHP >=7.2

What is the new behavior?

Regenerate Braze lib and lock jane-php/open-api-runtime to 7.5

BREAKING CHANGE: PHP >=8.0

Checklist:

• Conventional Commits
• Tests
• Documentation