unicode: upgrade to Unicode 15.1.0

[cowtoolz]

Go version

go version go1.21.5 linux/amd64

Output of go env in your module/workspace:

not applicable

What did you do?

https://go.dev/play/p/9biSMo4sTqo

What did you see happen?

15.0.0

What did you expect to see?

15.1.0

[gopherbot]

Change https://go.dev/cl/556397 mentions this issue: all: upgrade to Unicode 15.1.0

[gopherbot]

Change https://go.dev/cl/556515 mentions this issue: idna: upgrade to Unicode 15.1.0

[cagedmantis]

cc @golang/security @robpike

[gopherbot]

Change https://go.dev/cl/565155 mentions this issue: all: upgrade to Unicode 15.1.0

[cowtoolz]

All three CLs to upgrade to 15.1.0 are complete and ready to be merged

• unicode CL 556397
• x/text CL 565155
• x/net CL 556515