0.50.34 Notification fixes mainly, security update

What's Changed

• Adding small amount of cache to common functions by @dgtlmoon in #3565
• Handle format= in apprise URLs by @dgtlmoon in #3567
• Try this parallel tests by @dgtlmoon in #3568
• Unify safe URL checking to the one function, strengthen tests and filters by @dgtlmoon in #3564
• Run all pytests in parallel by @dgtlmoon in #3569
• Fixes to notification 'send test notification' by @dgtlmoon in #3571

Full Changelog: 0.50.33...0.50.34