[Vendor] Switch go-version lib (#12719)

* vendor: switch from "mcuadros/go-version" to "hashicorp/go-version"

* Adapt P1

* simplify

* fix lint

* adapt

* fix lint & rm old code

* no deadlock

* rm RWMutex and check GoVersion only 1-time

* Copyright header

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

modules/git/command.go

@@ -1,3 +1,4 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
 // Copyright 2015 The Gogs Authors. All rights reserved.
 // Use of this source code is governed by a MIT-style
 // license that can be found in the LICENSE file.
@@ -11,12 +12,10 @@ import (
 	"io"
 	"os"
 	"os/exec"
-	"runtime"
 	"strings"
 	"time"
 
 	"code.gitea.io/gitea/modules/process"
-	"github.com/mcuadros/go-version"
 )
 
 var (
@@ -132,7 +131,7 @@ func (c *Command) RunInDirTimeoutEnvFullPipelineFunc(env []string, timeout time.
 	}
 
 	// TODO: verify if this is still needed in golang 1.15
-	if version.Compare(runtime.Version(), "go1.15", "<") {
+	if goVersionLessThan115 {
 		cmd.Env = append(cmd.Env, "GODEBUG=asyncpreemptoff=1")
 	}
 	cmd.Dir = dir