all: upgrade go directive to at least 1.25.0 [generated]

By now Go 1.26.0 has been released, and Go 1.24 is no longer supported
per the Go Release Policy (see https://go.dev/doc/devel/release#policy).

See go.dev/doc/godebug#go-125 for GODEBUG changes relevant to Go 1.25.

For golang/go#69095.

[git-generate]
(cd . && go get [email protected] && go mod tidy)

Change-Id: I6a773ffcfbbce8cb96921ec8cb5fc384914efae9
Reviewed-on: https://go-review.googlesource.com/c/sync/+/744620
Auto-Submit: Gopher Robot <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Junyang Shao <[email protected]>
Reviewed-by: Michael Pratt <[email protected]>

Author: gopherbot

go.mod

@@ -1,3 +1,3 @@
 module golang.org/x/sync
 
-go 1.24.0
+go 1.25.0