chore(deps): update dependency go to v1.25.3

| datasource     | package | from   | to     |
| -------------- | ------- | ------ | ------ |
| golang-version | go      | 1.24.7 | 1.25.3 |


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

Author: renovate-sh-app[bot]

go.mod

@@ -2,7 +2,7 @@ module github.com/grafana/crossplane-provider-grafana
 
 go 1.24.6
 
-toolchain go1.24.7
+toolchain go1.25.3
 
 require (
 	dario.cat/mergo v1.0.2