Version bump to 2.215.0

[joshdholtz]

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Changes since release '2.214.0':

• [spaceship] add request retry with backoff when encountring 429 errors (Add request retry with backoff when encountring 429 errors #21511) via Stefan Natchev (@snatchev)
• [supply] introduce a new synchronization logic for screenshots ([supply] introduce a new synchronization logic for screenshots #21498) via Olivier Halligon (@AliSoftware)
• [deliver] validate the status of app version to be ready_for_review before submitting the app (validate the status of app version to be ready_for_review before submitting the app #20515) via 醉 (@404pilot)
• [match] Added s3_skip_encryption parameter ([match] Added s3_skip_encryption parameter #21018) via Morten Bøgh (@mbogh)
• [docs] add minor branding guidelines to CONTRIBUTING.md ([docs] add minor branding guidelines to CONTRIBUTING.md #21495) via Roger Oba (@rogerluan)
• [match] prevent directory download from s3 ([match] prevent directory download from s3 #20975) via Mark Homoki (@markhomoki)
• [xcodes] fix issue where xcodes action wouldn't accept beta versions of Xcode ([xcodes] fix issue where xcodes action wouldn't accept beta versions of Xcode #21434) via apps4everyone (@apps4everyone)
• [spaceship] explicit beta group access to all builds at creation (Explicit beta group access to all builds at creation #21478) via Vincent Isambart (@vincentisambart)
• [docs] update pull request template to ask contributors to write unit tests ([docs] update pull request template to ask contributors to write unit tests #21427) via Roger Oba (@rogerluan)
• [action] deprecate the ensure_xcode_version action ([action] deprecate the ensure_xcode_version action #21448) via Iulian Onofrei (@revolter)
• [tests] stop generating rspec temp file in current directory ([tests] stop generating rspec temp file in current directory #21466) via Roger Oba (@rogerluan)
• [ci] fix CI by replacing deprecated Xcode versions, and add Xcode 14, Xcode 15, and Ruby 3.1 to test envs ([ci] fix CI by replacing deprecated Xcode versions, and add Xcode 14, Xcode 15, and Ruby 3.1 to test envs #21465) via Roger Oba (@rogerluan)
• [deliver][frameit] add iPhone 14 Pro / 6.1" display type (add iPhone 14 Pro / 6.1" display type #21393) via Stefan Natchev (@snatchev)
• [spaceship] add missing AppStoreState cases ([spaceship] add missing AppStoreState cases #21312) via Roger Oba (@rogerluan)
• [fastlane_core] fix WWDR certificates import flow ([fastlane_core] fix WWDR certificates import flow #21442) via Paul Taykalo (@PaulTaykalo)
• [docs] fix tool name formatting (for supply) to be lowercase to pass fastlane docs unit tests ([docs] fix tool name formatting (for supply) to be lowercase to pass fastlane docs unit tests #21426) via Roger Oba (@rogerluan)