chore: update Go version to 1.23.6 and adjust documentation (#50)

* chore: update Go version to 1.23.6 and adjust documentation

* chore: downgrade Go version to 1.23.0 and update related documentation

Author: flc1125

README.md

@@ -1,6 +1,6 @@
 # Gitlab Webhook Dispatcher 🚀
 
-![Supported Go Versions](https://img.shields.io/badge/Go-%3E%3D1.23-blue)
+![Supported Go Versions](https://img.shields.io/badge/Go-%3E%3D1.23.0-blue)
 [![Package Version](https://badgen.net/github/release/flc1125/go-gitlab-webhook/stable)](https://github.com/flc1125/go-gitlab-webhook/releases)
 [![GoDoc](https://pkg.go.dev/badge/github.com/flc1125/go-gitlab-webhook/v2)](https://pkg.go.dev/github.com/flc1125/go-gitlab-webhook/v2)
 [![codecov](https://codecov.io/gh/flc1125/go-gitlab-webhook/graph/badge.svg?token=QPTHZ5L9GT)](https://codecov.io/gh/flc1125/go-gitlab-webhook)

go.mod

@@ -2,8 +2,6 @@ module github.com/flc1125/go-gitlab-webhook/v2
 
 go 1.23.0
 
-toolchain go1.23.6
-
 require (
 	github.com/stretchr/testify v1.10.0
 	gitlab.com/gitlab-org/api/client-go v0.123.0

renovate.json

@@ -7,7 +7,7 @@
   "separateMajorMinor": true,
   "postUpdateOptions": ["gomodTidy"],
   "constraints": {
-    "go": "1.23"
+    "go": "1.23.0"
   },
   "packageRules": [
     {