fix(deps): update module github.com/improbable-eng/grpc-web to v0.15.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/improbable-eng/grpc-web	require	minor	v0.14.1 -> v0.15.0

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Release Notes

improbable-eng/grpc-web

v0.15.0

Compare Source

See CHANGELOG for details

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[codecov]

Codecov Report

Merging #574 (bcf3249) into master (772e0b1) will decrease coverage by 0.84%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #574      +/-   ##
==========================================
- Coverage   35.82%   34.98%   -0.85%     
==========================================
  Files          24       24              
  Lines        2618     2618              
==========================================
- Hits          938      916      -22     
- Misses       1541     1562      +21     
- Partials      139      140       +1     

Impacted Files	Coverage Δ
pkg/sfu/subscriber.go	47.43% <0.00%> (-8.98%)	⬇️
pkg/sfu/router.go	40.35% <0.00%> (-4.68%)	⬇️

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[renovate]

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