🌱 Updated Bastion node's AMI. Changed the OS version to Ubuntu 20.04 from Ubuntu 16.04

[LochanRn]

What this PR does / why we need it:

Updated the OS version of the bastion node. The current AMI's are Ubuntu 16.04 which is two years old and it has security vulnerabilities.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

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[k8s-ci-robot]

Hi @LochanRn. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[LochanRn]

I signed it

[jzhoucliqr]

/check-cla

[WillsonHG]

/check-cla

[detiber]

/ok-to-test
/lgtm

[randomvariable]

/approve

[k8s-ci-robot]

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