chore(deps): bump Go version to v1.25.0 (#98)

Signed-off-by: Ville Vesilehto <ville.vesilehto@upcloud.com>

Author: thevilledev

go.mod

@@ -1,6 +1,6 @@
 module github.com/UpCloudLtd/packer-plugin-upcloud
 
-go 1.24.6
+go 1.25.0
 
 require (
 	github.com/UpCloudLtd/upcloud-go-api/v8 v8.25.0