x/sys/unix/linux: update Linux kernel to v6.6

[mauri870]

Update the Dockerfile to clone Linux v6.6 and commit the
changes generated by GOOS=linux ./mkall.sh.

Fixes golang/go#63833

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Message from Tobias Klauser:

Patch Set 1: Code-Review+2

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Message from Tobias Klauser:

Patch Set 1: Auto-Submit+1 Commit-Queue+1 Run-TryBot+1

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Message from Go LUCI:

Patch Set 1:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2023-10-31T09:46:57Z","revision":"9bc148b46d425fd266cf36f6a0cbb26cde0ff473"}

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Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Message from Tobias Klauser:

Patch Set 1: -Commit-Queue

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Message from Go LUCI:

Patch Set 1:

This CL has passed the run

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Message from Go LUCI:

Patch Set 1: LUCI-TryBot-Result+1

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Message from Gopher Robot:

Patch Set 1: TryBot-Result+1

(1 comment)

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Message from Cherry Mui:

Patch Set 1: Code-Review+1

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This PR is being closed because golang.org/cl/538378 has been merged.