Remove centos 7 docker image #1275

Job	Run time
static-analysis / detekt	2m 53s
static-analysis / ktlint	3m 15s
check-cache / Check cache	12s
build-android-packages	11m 38s
build-macos-x64-packages	34m 25s
build-jni-swig-stub	2m 19s
build-kotlin-metadata-package	5m 28s
build-ios-arm64-packages	41m 38s
build-ios-x64-packages	29m 36s
build-macos-arm64-packages	29m 35s
check-release-build	7s
build-jvm-macos-native-lib	5m 40s
build-jvm-linux-native-lib	5m 4s
build-jvm-windows-native-lib	7m 24s
build-jvm-packages	8m 52s
test-android-packages-emulator (base)	25m 2s
test-android-packages-emulator (sync)	24m 45s
AWS Device Farm Sync Tests	23m 31s
AWS Device Farm	0s
test-jvm-packages (macos-12, base)	8m 17s
test-jvm-packages (macos-12, sync)	20m 21s
test-jvm-packages (ubuntu-latest, base)	5m 15s
test-jvm-packages (ubuntu-latest, sync)	20m 19s
test-jvm-packages (windows-latest, base)	8m 9s
test-ios-packages (macos-12, base)	14m 59s
test-ios-packages (macos-12, sync)	14m 38s
test-macos-packages (macos-12, base)	9m 18s
test-macos-packages (macos-12, sync)	9m 35s
package-all-artifacts	8s
integration-tests	1s
deploy-snapshot	1s
deploy-release	1s
	6h 12m 26s

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