[infra] Fix presubmit by pinning tools/build

Change-Id: I9f44062d43c8e6810247050521cdb4f450827d23
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/247961
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Eric Boren <borenet@google.com>
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/248083
Reviewed-by: Eric Boren <borenet@google.com>