[golang/go] build: build failure on go1.26-linux-arm64_c4as16-perf_vs_release

### ROOT CAUSE The build failure on the builder `go1.26-linux-arm64_c4as16-perf_vs_release` is likely due to a version mismatch between the Go language version (Go1.26) and the toolchain version. The research context indicates that Go1.22 is a language version but not a toolchain version, and the toolchain must be explicitly tagged with the minor version (e.g., `go1.22.x`). This pattern suggests that the builder might be using an incorrect toolchain version, causing the build to fail. ### CODE FIX Update the toolchain version for the builder to match the language version. Specifically, ensure the toolchain is tagged with the minor version (e.g., `go1.26.x`). Modify the CI configuration for the builder `go1.26-linux-arm64_c4as16-perf_vs_release` to use the correct toolchain version. For example, in the Go CI configuration, change the builder definition to use `go1.26.x` instead of `go1.26`. Example change in the CI configuration (if using Go's `buildall.bash` or similar): ```bash # Before ./all.bash test -cpu=arm64 -builder=go1.26-linux-arm64_c4as16-perf_vs_release # After ./all.bash test -cpu=arm64 -builder=go1.26.x-linux-arm64_c4as16-perf_vs_release ``` This ensures the toolchain version aligns with the language version, preventing build failures due to version mismatches.