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 go@1.25.0 && go mod tidy)
(cd x509roots/fallback && go get go@1.25.0 && go mod tidy)

Change-Id: I8df6bf58a117a2f92bb08f787e520aa9446dab46
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/744680
Reviewed-by: Junyang Shao <shaojunyang@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>

go.mod

@@ -1,6 +1,6 @@
 module golang.org/x/crypto
 
-go 1.24.0
+go 1.25.0
 
 require (
 	golang.org/x/net v0.49.0 // tagx:ignore

x509roots/fallback/go.mod

@@ -1,3 +1,3 @@
 module golang.org/x/crypto/x509roots/fallback
 
-go 1.24.0
+go 1.25.0