Bump go from 1.21 to 1.22 (#176)

Update go version in `go.mod`

```
$ go mod edit -go=1.22
```

Bump go version on CI.

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ jobs:
           fetch-depth: 0
       - uses: actions/setup-go@v5
         with:
-          go-version: '1.21'
+          go-version: '1.22'
       - name: Build & Test
         run: |
           go build -v

.github/workflows/coverage.yml

@@ -11,7 +11,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5
         with:
-          go-version: '1.21'
+          go-version: '1.22'
       - run: go build
       - uses: paambaati/[email protected]
         env:

.github/workflows/release.yml

@@ -14,7 +14,7 @@ jobs:
         run: git fetch --force --tags
       - uses: actions/setup-go@v5
         with:
-          go-version: '1.21'
+          go-version: '1.22'
       - name: Release via goreleaser
         uses: goreleaser/goreleaser-action@v5
         with:

.github/workflows/reviewdog.yml

@@ -10,7 +10,7 @@ jobs:
           ref: ${{ github.event.pull_request.head.sha }}
       - uses: actions/setup-go@v5
         with:
-          go-version: '1.21'
+          go-version: '1.22'
       - uses: reviewdog/action-staticcheck@v1
         with:
           fail_on_error: true

go.mod

@@ -1,6 +1,6 @@
 module github.com/toshimaru/nyan
 
-go 1.21.0
+go 1.22
 
 require (
 	github.com/alecthomas/chroma v0.10.0