[now dev] Bump @now/build-utils to 0.9.4

[AndyBitz]

Bump @now/build-utils to 0.9.4

[codecov-io]

Codecov Report

Merging #2621 into canary will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           canary   #2621      +/-   ##
=========================================
- Coverage    7.96%   7.95%   -0.02%     
=========================================
  Files         258     258              
  Lines        9404    9396       -8     
  Branches     1068    1066       -2     
=========================================
- Hits          749     747       -2     
+ Misses       8606    8600       -6     
  Partials       49      49

Impacted Files	Coverage Δ
src/util/dev/builder-cache.ts	29.65% <0%> (+0.1%)	⬆️
src/util/metrics.ts	68.18% <0%> (+6.64%)	⬆️

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