Update Go version

[FlowingSPDG]

Hi, I tried to make a plugin by myself and noticed Go itself and several tools version are old so I updated.

Updated tools

• Go 1.19 -> 1.23 (go mod tidy -go=1.23)
• golangci-lint v1.50.0 -> v1.61.1
• yaegi 0.14.2 -> v0.16.1

Updated tool settings

• golangci-lint
  • Update deprecated/deactivated linters.
  • replace goerr133 to err133
  • replaced fmt.Errorf to errors.New

Other

Maybe we can use package plugindemo instead of package plugindemo_test for demo_test.go since golangci-lint detects depguard because it imports not-test package?

[FlowingSPDG]

@ldez Hey, thanks for the review!

I applied your suggestion :) thank you!

[ldez]

All the following section:

```yml steps: # https://github.com/marketplace/actions/setup-go-environment - name: Set up Go ${{ matrix.go-version }} on ${{ matrix.os }}(${{ matrix.arch }}) uses: actions/setup-go@v5 with: go-version: ${{ matrix.go-version }} architecture: ${{ matrix.arch }} # https://github.com/marketplace/actions/checkout - name: Checkout code uses: actions/checkout@v2 # https://github.com/marketplace/actions/cache - name: Cache Go modules uses: actions/cache@v3 with: # In order: # * Module download cache # * Build cache (Linux) # * Build cache (Mac) # * Build cache (Windows) path: | ~/go/pkg/mod ~/.cache/go-build ~/Library/Caches/go-build %LocalAppData%\go-build key: ${{ runner.os }}-${{ matrix.arch }}-${{ matrix.go-version }}-go-${{ hashFiles('**/go.sum') }} restore-keys: | ${{ runner.os }}-${{ matrix.arch }}-${{ matrix.go-version }}-go- ```

should be replaced by:

steps:
  - uses: actions/checkout@v4
  - uses: actions/setup-go@v5
    with:
      go-version: ${{ matrix.go-version }}
      architecture: ${{ matrix.arch }}