Fixed PHP 8.4 deprecations.

[basmilius]

Description of the change

A few deprecation warnigns were raised as of PHP 8.4 in Rollbar. Namely the usage of E_STRICT (which was unused before 8.4) and implicitly marking nullable parameters as null. I've simply removed the usages of E_STRICT and added null types where they were missing.

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Maintenance
• New release

Checklists

Development

• Lint rules pass locally
• The code changed/added as part of this pull request has been covered with tests
• All tests related to the changed code pass in development

Code review

• This pull request has a descriptive title and information useful to a reviewer. There may be a screenshot or screencast attached
• "Ready for review" label attached to the PR and reviewers assigned
• Issue from task tracker has a link to this pull request
• Changes have been reviewed by at least one other engineer

[danielmorell]

@basmilius Thank you for your work on this! This looks good.