build failures due to golang version mismatches

[ryepup]

Describe the bug

Daily run is failing: https://github.com/nginx/nginx-directive-reference/actions/runs/26295790294

golang.org/x/tools/gopls@latest: golang.org/x/tools/gopls@v0.22.0 requires go >= 1.26.0 (running go 1.25.10; GOTOOLCHAIN=local)

same as #482

To reproduce

1. cd tools/devtools
2. make devtools-image
3. command fails on installing golang tools

Expected behavior

Command works, making an image that can be used to build the rest of the code.

Your environment

CI pipeline