all: upgrade to Unicode 15.1.0

[weebney]

This upgrades x/text from Unicode 15.0.0 to Unicode 15.1.0
via go generate.

The only other changes are extremely minor changes to internal/export/idna
TestConformance to account for changes on the Unicode file server.

There are complementary changes to unicode (CL 556397) and x/net/idna
(CL 556515).

Updates golang/go#65141

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Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Message from William:

Patch Set 2:

(1 comment)

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Message from Jorropo:

Patch Set 2: Commit-Queue+1

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Message from Go LUCI:

Patch Set 2:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2024-02-18T20:14:34Z","revision":"badcdb4bac492895f4edde9199497563308bb542"}

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Message from Jorropo:

Patch Set 2: -Commit-Queue

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Message from Go LUCI:

Patch Set 2:

This CL has passed the run

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Message from Go LUCI:

Patch Set 2: LUCI-TryBot-Result+1

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