idna: upgrade to Unicode 15.1.0

[weebney]

Changes generated in x/text for Unicode 15.1.0;
this is complementary to CL 556397 and CL 565155.

Updates golang/go#65141

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Message from Gopher Robot:

Patch Set 1:

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Message from William:

Patch Set 1:

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Message from Jorropo:

Patch Set 2: Run-TryBot+1

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Message from Gopher Robot:

Patch Set 2:

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Message from Gopher Robot:

Patch Set 2:

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Message from Gopher Robot:

Patch Set 2: TryBot-Result+1

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Message from Damien Neil:

Patch Set 2:

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Message from William:

Patch Set 4:

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Message from Damien Neil:

Patch Set 4:

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Message from William:

Patch Set 4:

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Message from Damien Neil:

Patch Set 4:

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