Exclude grpcio==1.48.0

[tvalentyn]

Exclude the broken version grpcio==1.48.0
Fixes #22533

Please add a meaningful description for your change here

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[tvalentyn]

R: @chamikaramj

[github-actions]

Stopping reviewer notifications for this pull request: review requested by someone other than the bot, ceding control

[codecov]

Codecov Report

Merging #22539 (10e092e) into master (e5e3cb2) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #22539   +/-   ##
=======================================
  Coverage   74.17%   74.17%           
=======================================
  Files         706      706           
  Lines       93229    93229           
=======================================
+ Hits        69148    69154    +6     
+ Misses      22813    22807    -6     
  Partials     1268     1268           

Flag	Coverage Δ
python	83.54% <ø> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
.../python/apache_beam/testing/test_stream_service.py	88.09% <0.00%> (-4.77%)	⬇️
...che_beam/runners/interactive/interactive_runner.py	90.06% <0.00%> (-1.33%)	⬇️
sdks/python/apache_beam/internal/metrics/metric.py	93.00% <0.00%> (-1.00%)	⬇️
...eam/runners/portability/fn_api_runner/execution.py	92.44% <0.00%> (-0.65%)	⬇️
sdks/python/apache_beam/runners/common.py	88.59% <0.00%> (-0.13%)	⬇️
...on/apache_beam/examples/complete/juliaset/setup.py	0.00% <0.00%> (ø)
sdks/python/apache_beam/transforms/util.py	96.22% <0.00%> (+0.15%)	⬆️
...eam/runners/interactive/interactive_environment.py	92.02% <0.00%> (+0.30%)	⬆️
...hon/apache_beam/runners/worker/bundle_processor.py	93.54% <0.00%> (+0.37%)	⬆️
sdks/python/apache_beam/transforms/combiners.py	93.43% <0.00%> (+0.38%)	⬆️
... and 4 more

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[chamikaramj]

LGTM. Thanks.