Bump python 1.7.0 => 1.9.0 #1228

Job	Run time
build-ts (ubuntu-latest)	20s
build-go (ubuntu-latest)	11s
build-python (ubuntu-latest)	22s
build-dotnet (ubuntu-latest)	21s
build-java (ubuntu-latest)	30s
build-php (ubuntu-latest)	30s
feature-tests-go / test	2m 2s
feature-tests-python / test	1m 8s
feature-tests-ts / test	1m 58s
feature-tests-dotnet / test	1m 3s
feature-tests-php / test	1m 58s
feature-tests-java / test	1m 43s
build-docker-images / build-go-docker-images / Build go docker image	4m 3s
build-docker-images / build-php-docker-images / Build php docker image	4m 15s
build-docker-images / build-python-docker-images / Build py docker image	2m 51s
build-docker-images / build-java-docker-images / Build java docker image	4m 5s
build-docker-images / build-ts-docker-images / Build ts docker image	4m 53s
build-docker-images / build-dotnet-docker-images / Build cs docker image	2m 5s
	34m 18s

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