Fixed KFserving version to v0.6.0 for Alibi Detect Server

[axsaucedo]

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

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Does this PR introduce a user-facing change?:

[seldondev]

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[axsaucedo]

/test integration

[axsaucedo]

/test notebooks

[axsaucedo]

Merging as explainer tests pass

[seldondev]

@axsaucedo: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
integration	525b736	link	/test integration
notebooks	525b736	link	/test notebooks

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