Update SapMachine to higher version

[skateball]

Hi colleageus,
can we upgrade this to SapMachine 17 or SapMachine 21?

cloud-objectstore-java-sample/README.md

Line 133 in ac6ab3d

JBP_CONFIG_SAP_MACHINE_JRE: '{ jre: { version: "11.+" } }'

Regards Christian