v2.53.3 🤖

What’s Changed

• chore: bump version to 2.53.3 @temporal-cicd[bot] (#3819)
• Add back resetHeartbeat option to Standalone Activity reset @laurakwhit (#3817)
• Bump API to v1.63.5 @laurakwhit (#3808)
• VLN-1578: remediate checkout-below-v7 @picatz (#3699)
• fix: resolve open Dependabot security alerts @rossnelson (#3815)
• VLN-1585: remediate claude-code-action-unhardened @picatz (#3778)
• fix: align heading/timestamp spacing across primitive list headers @bilal-karim (#3805)
• Bump Go to 1.26.5 @rossnelson (#3814)
• [DT-4308] Nexus-Invoked Standalone Activities (UI) @rossedfort (#3794)
• fix(modal): notify once on every dismissal via the dialog close event @rossedfort (#3813)
• feat(DT-4359): Schedules content updates @tegan-temporal (#3804)