chore(deps): update dependency go to v1.25.4

| datasource     | package | from   | to     |
| -------------- | ------- | ------ | ------ |
| golang-version | go      | 1.24.2 | 1.25.4 |


Signed-off-by: renovate-sh-app[bot] <219655108+renovate-sh-app[bot]@users.noreply.github.com>

Author: renovate-sh-app[bot]

examples/apiserver/go.mod

@@ -2,7 +2,7 @@ module github.com/grafana/grafana-app-sdk/examples/apiserver
 
 go 1.24.1
 
-toolchain go1.24.2
+toolchain go1.25.4
 
 replace github.com/grafana/grafana-app-sdk => ../../