go.mod: update x/tools to HEAD

[yarcat]

go get -u golang.org/x/tools
go mod tidy

x/tools/go/ssa is used by message/pipeline. Generics instantiation in
x/tools@0.1.11 could be confused with container index. However,
x/tools/go/ssa does have it fixed in x/tools@0.1.12 (see golang/go#52834).
This change upgrades the required version to ensure that fewer users of
message/pipelines have issues.

Updates golang/go#54086

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Patch Set 1:

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Message from Tim King:

Patch Set 1: Run-TryBot+1

(3 comments)

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Patch Set 1:

(1 comment)

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Patch Set 1: TryBot-Result+1

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This PR (HEAD: 0f46ec0) has been imported to Gerrit for code review.

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Message from Jaroslavs Samcuks:

Patch Set 1:

(2 comments)

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Message from Jaroslavs Samcuks:

Patch Set 2:

(1 comment)

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This PR (HEAD: 351404b) has been imported to Gerrit for code review.

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Message from Jaroslavs Samcuks:

Patch Set 5:

(1 comment)

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Message from Tim King:

Patch Set 5: Code-Review+2

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Message from Peter Weinberger:

Patch Set 5: Code-Review+1

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This PR is being closed because golang.org/cl/422414 has been merged.