build: update Go from 1.24.6 to 1.25.8

- Update go directive in go.mod from 1.24.6 to 1.25.8
- Update golang Docker image in cloudbuild.yaml from 1.24 to 1.25
- All tests pass, linter reports 0 issues

Co-Authored-By: Claude <noreply@anthropic.com>
Signed-off-by: Stephen Augustus <foo@auggie.dev>

Author: 2 people

cloudbuild.yaml

@@ -1,8 +1,8 @@
 steps:
-- name: golang:1.24
+- name: golang:1.25
   entrypoint: go
   args: ['install', 'github.com/google/ko@v0.18.0']
-- name: golang:1.24
+- name: golang:1.25
   entrypoint: bash
   args: ['-c', 'KO_DOCKER_REPO="gcr.io/allstar-ossf" /go/bin/ko publish ./cmd/allstar > container']
 - name: gcr.io/google.com/cloudsdktool/cloud-sdk

go.mod

@@ -1,6 +1,6 @@
 module github.com/ossf/allstar
 
-go 1.24.6
+go 1.25.8
 
 require (
 	github.com/Masterminds/semver/v3 v3.4.0