all: upgrade go directive to at least 1.23.0 [generated]

By now Go 1.24.0 has been released, and Go 1.22 is no longer supported
per the Go Release Policy (https://go.dev/doc/devel/release#policy).

For golang/go#69095.

[git-generate]
(cd . && go get [email protected] && go mod tidy && go fix ./... && go mod edit -toolchain=none)

Change-Id: I7e3b1e073a0a64e82e2b9e49387d5da0afd9d58b
Reviewed-on: https://go-review.googlesource.com/c/sync/+/649835
Reviewed-by: Dmitri Shuralyov <[email protected]>
Reviewed-by: Cherry Mui <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Auto-Submit: Gopher Robot <[email protected]>

go.mod

@@ -1,3 +1,3 @@
 module golang.org/x/sync
 
-go 1.18
+go 1.23.0