all: upgrade go directive to at least 1.24.0 [generated]

By now Go 1.25.0 has been released, and Go 1.23 is no longer supported
per the Go Release Policy (see https://go.dev/doc/devel/release#policy).

For golang/go#69095.

[git-generate]
(cd . && go get go@1.24.0 && go mod tidy && go fix ./... && go mod edit -toolchain=none)

Change-Id: I6412f3747659152575d1fb5c3163daf749b8ab18
Reviewed-on: https://go-review.googlesource.com/c/pkgsite-metrics/+/695419
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Gopher Robot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
diff --git a/go.mod b/go.mod
index c087866..dab67b7 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module golang.org/x/pkgsite-metrics
 
-go 1.23.0
+go 1.24.0
 
 require (
 	cloud.google.com/go v0.110.7