Bump MLServer image to 1.0.0.rc2

[adriangonz]

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[adriangonz]

/test integration

[adriangonz]

/test notebooks

[seldondev]

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[axsaucedo]

It some failures on integration tests may be flaky but rerunning to validate - notebook tests pass 👍

/test integration

[adriangonz]

I think that the errors were actually legit ones. I've fixed the failing tests, and now testing locally first.

[adriangonz]

/test integration

[adriangonz]

/test integration

[adriangonz]

We've got green checks for the integration and (previously) for the notebooks tests! I'll cut the 1.0 release in MLServer and will update this PR 👍