Unable to lint with `GOEXPERIMENT=jsonv2`

### Welcome - [x] Yes, I understand that the GitHub action repository is not the repository of golangci-lint itself. - [x] Yes, I've searched similar issues on GitHub and didn't find any. - [x] Yes, I've included all information below (version, config, etc). ### Description of the problem While I can successfully run v2.10.1 with `GOEXPERIMENT=jsonv2` locally, it fails with `go: unknown GOEXPERIMENT jsonv2` when I run it as a GH Action. Output: <details> ``` > Run env ... GOEXPERIMENT=jsonv2 > Run golangci-lint version golangci-lint has version 2.10.1 built with go1.26.0 from 5d1e709b on 2026-02-17T15:27:33Z > Run golangci-lint run golangci-lint run shell: /usr/bin/bash -e {0} env: GOEXPERIMENT: jsonv2 level=error msg="[formatter] gci: command \"go env -json GOMOD\": exit status 2: " level=warning msg="[gomod_salt] Failed to calculate go.mod salt: failed to get goenv: command \"go env -json GOMOD\": exit status 2: " level=warning msg="Failed to discover go env: command \"go env -json GOCACHE GOROOT\": exit status 2: " level=error msg="Running error: context loading failed: failed to load packages: failed to load packages: failed to load with go/packages: err: exit status 2: stderr: go: unknown GOEXPERIMENT jsonv2\n" Error: Process completed with exit code 3. ``` </details> ### Version of golangci-lint v2.10.1 ### Version of the GitHub Action v9 ### Workflow file <details> ```yml name: "Lint" on: pull_request env: GOEXPERIMENT: jsonv2 jobs: lint: runs-on: ubuntu-latest steps: - uses: actions/checkout@v6 - uses: golangci/golangci-lint-action@v9 with: install-only: true - run: env - run: golangci-lint version - run: golangci-lint run ``` </details> ### Golangci-lint configuration none ### Go version 1.26 ### Code example or link to a public repository <details> ```go package main import ( "encoding/json/v2" "fmt" ) func main() { bin, err := json.Marshal(map[string]string{"key": "value"}) if err != nil { panic(err) } fmt.Println(string(bin)) } ``` </details>