remove period from URL so that it opens correctly in vscode

[jonahwilliams]

Description

vscode attempts to open a URL with a period at the end.

Fixes #43199

[codecov]

Codecov Report

Merging #43200 into master will decrease coverage by 1%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #43200      +/-   ##
==========================================
- Coverage   61.13%   60.13%   -1.01%     
==========================================
  Files         195      195              
  Lines       18954    18942      -12     
==========================================
- Hits        11587    11390     -197     
- Misses       7367     7552     +185

Flag	Coverage Δ
#flutter_tool	60.13% <100%> (-1.01%)	⬇️

Impacted Files	Coverage Δ
...ools/lib/src/build_runner/resident_web_runner.dart	79.34% <100%> (ø)	⬆️
packages/flutter_tools/lib/src/ios/simulators.dart	3.26% <0%> (-47.29%)	⬇️
...ckages/flutter_tools/lib/src/ios/code_signing.dart	62.31% <0%> (-36.24%)	⬇️
packages/flutter_tools/lib/src/cache.dart	26.2% <0%> (-22.98%)	⬇️
...ckages/flutter_tools/lib/src/flutter_manifest.dart	77.94% <0%> (-6.67%)	⬇️
packages/flutter_tools/lib/src/version.dart	93.23% <0%> (-1.94%)	⬇️
...ges/flutter_tools/lib/src/application_package.dart	65.94% <0%> (-1.09%)	⬇️
packages/flutter_tools/lib/src/run_hot.dart	68.25% <0%> (-0.22%)	⬇️
packages/flutter_tools/lib/src/artifacts.dart	71.37% <0%> (+2.06%)	⬆️
packages/flutter_tools/lib/src/macos/xcode.dart	61.66% <0%> (+10%)	⬆️
... and 3 more

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