CI: Update XLA from 1.9 to 1.12

[akihironitta]

What does this PR do?

• Updates XLA from 1.9 to 1.12 to be used in TPU testing in CI.
• Fixes the stale failure of building base-xla docker image.
• Closes Update TPU CI to latest XLA version #13818 cc @Borda @carmocca @akihironitta @kaushikb11 @rohitgr7 @awaelchli

Does your PR introduce any breaking changes? If yes, please list them.

None

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cc @carmocca @akihironitta @Borda @kaushikb11 @rohitgr7

[awaelchli]

Oh no, we have a test failure and it doesn't surface (from master) 😭
Did I mess something up in #11098?
This is so strange, back then, all test errors would always result in a failed CI signal.

[awaelchli]

Need to investigate in #14034

[carmocca]

@akihironitta Why did you pin to this specific release?

I am still seeing the OSError in #14926. I'll try unpinning

[akihironitta]

If I remember correctly, that version was the latest release that worked in our CI at the time. I believe there's no other reason, so we can try unpinning it.