chore(go): upgrade to v1.21

.github/workflows/release.yml

@@ -30,7 +30,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: 1.19
+          go-version-file: go.mod
           cache: true
       - name: Run GoReleaser
         uses: goreleaser/goreleaser-action@v5

docs/content/en/getting-started/installation.md

@@ -128,7 +128,7 @@ Contributions are welcome!
 To build the extended edition of `tdl` from source you must:
 
 1. Install [Git](https://git-scm.com/)
-2. Install [Go](https://go.dev/) version 1.19 or later
+2. Install [Go](https://go.dev/) version 1.21 or later
 3. Update your `PATH` environment variable as described in the Go documentation
 
 {{< hint info >}}

docs/content/zh/getting-started/installation.md

@@ -127,7 +127,7 @@ brew install telegram-downloader
 要从源代码构建 `tdl` 的扩展版本，您必须：
 
 1. 安装 [Git](https://git-scm.com/)
-2. 安装 Go 的 1.19 版本或更高版本
+2. 安装 Go 的 1.21 版本或更高版本
 3. 根据 Go 文档中的描述更新您的 `PATH` 环境变量
 
 {{< hint info >}}

docs/go.mod

@@ -1,5 +1,5 @@
 module github.com/iyear/tdl/docs
 
-go 1.19
+go 1.21
 
 require github.com/alex-shpak/hugo-book v0.0.0-20230808113920-3f1bcccbfb24 // indirect

go.mod

@@ -1,6 +1,6 @@
 module github.com/iyear/tdl
 
-go 1.19
+go 1.21
 
 require (
 	github.com/AlecAivazis/survey/v2 v2.3.7