fix(utils): routeToChunkName with invalid regular expression

[ycjcl868]

Checklist

• npm test passes
• tests are included
• documentation is changed or added
• commit message follows commit guidelines

Description of change

• any feature?
• close https://github.com/umijs/umi/ISSUE_URL

[codecov]

Codecov Report

Merging #6156 (98a93ad) into master (d07bcdc) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #6156   +/-   ##
=======================================
  Coverage   82.85%   82.85%           
=======================================
  Files         159      159           
  Lines        3522     3522           
  Branches      948      948           
=======================================
  Hits         2918     2918           
  Misses        594      594           
  Partials       10       10           

Impacted Files	Coverage Δ
packages/bundler-webpack/src/index.ts	34.48% <100.00%> (ø)
packages/utils/src/routes.ts	100.00% <100.00%> (ø)

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