script/runtime: add Go 1.26 testDeps ModulePath

[chenrui333]

seeing the build failure against go1.26rc1

==> go build -trimpath -o=/opt/homebrew/Cellar/hof/HEAD-1613a4e/bin/hof -ldflags=-s -w -X github.com/hofstadter-io/hof/cmd/hof/verinfo.Version=HEAD-1613a4e -X github.com/hofstadter-io/hof/cmd/hof/verinfo.Commit=Homebrew -X github.com/hofstadter-io/hof/cmd/hof/verinfo.BuildDate=2024-12-31T22:09:53Z -X github.com/hofstadter-io/hof/cmd/hof/verinfo.GoVersion=1.26rc1 -X github.com/hofstadter-io/hof/cmd/hof/verinfo.BuildOS=darwin -X github.com/hofstadter-io/hof/cmd/hof/verinfo.BuildArch=arm64 ./cmd/hof
# github.com/hofstadter-io/hof/script/runtime
script/runtime/exe_next.go:52:26: cannot use nopTestDeps{} (value of struct type nopTestDeps) as testing.testDeps value in argument to testing.MainStart: nopTestDeps does not implement testing.testDeps (missing method ModulePath)

relates to

• go 1.26.0, go@1.25 1.25.7 (new formula) Homebrew/homebrew-core#258912
• hof: add go1.26 build patch and update default branch for head build Homebrew/homebrew-core#260266

[verdverm]

thanks for being out in front of this @chenrui333