Release 1.19.9

• Add Buildkite by @jkmassel in #1349
• Remove CircleCI by @jkmassel in #1359
• Expose indentation operations by @cbess in #1353
• Tools upgrade: Ruby 2.7.4, bash-cache 2.8.0 by @mokagio in #1363
• Add CHANGELOG.md by @mokagio in #1365
• Point bash-cache plugin to new a8c-ci-toolkit location by @mokagio in #1367
• Use NSString.paragraphRange method due to iOS 17 crash by @twstokes in #1373