v4.21.0

API Support

• #1319 Add delete workflow run support @szemek
• #1322 Add match refs support @AHaymond
• #1329 Add rename branch support @gmcgibbon
• #1332 Add billing actions support @M-Yamashita01

Error handling

• #1324 Handle path diff too large errors @yykamei

Code clean up

• #1326 Remove graduated preview headers @ivailop

Documentation

• #1314 Update authentication usage @curquiza
• #1317 Fix logo link @gjtorikian
• #1318 Fix GitHub typo @bl-ue