Pin pyinstrument version to 3.4.2

[ndodda-amazon]

Description of changes:

Pyinstrument 4.0.0 introduces breaking changes that cause Python profiling to fail with this error:

RuntimeError: Could not find app.js. If you are running pyinstrument from a git checkout, run 'python setup.py build' to compile the Javascript (requires nodejs).

It is unclear what the root cause is, because smdebug consumes pyinstrument consumed directly from PyPi and not from a git checkout. I was able to reproduce this error without smdebug on the TF 2.4 DLC images. See the issue I created against pyinstrument here: https://github.com/joerick/pyinstrument/issues/137.

Until this issue is debugged, the version of pyinstrument will be pinned to 3.4.2.

Style and formatting:

I have run pre-commit install && pre-commit run --all-files to ensure that auto-formatting happens with every commit.

Issue number, if available

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov-commenter]

Codecov Report

Merging #514 (5015ff5) into master (b9765cb) will decrease coverage by 1.79%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #514      +/-   ##
==========================================
- Coverage   75.15%   73.36%   -1.80%     
==========================================
  Files         127      117      -10     
  Lines       11110    10584     -526     
==========================================
- Hits         8350     7765     -585     
- Misses       2760     2819      +59     

Impacted Files	Coverage Δ
smdebug/pytorch/utils.py	45.23% <0.00%> (-35.72%)	:arrow_down:
smdebug/mxnet/utils.py	18.75% <0.00%> (-31.25%)	:arrow_down:
smdebug/rules/action/message_action.py	81.92% <0.00%> (-15.67%)	:arrow_down:
smdebug/xgboost/utils.py	0.00% <0.00%> (-14.76%)	:arrow_down:
smdebug/profiler/tf_profiler_parser.py	54.54% <0.00%> (-11.58%)	:arrow_down:
smdebug/rules/action/stop_training_action.py	54.68% <0.00%> (-7.82%)	:arrow_down:
smdebug/core/reduction_config.py	88.31% <0.00%> (-7.80%)	:arrow_down:
smdebug/mxnet/hook.py	83.33% <0.00%> (-6.82%)	:arrow_down:
smdebug/mxnet/collection.py	73.33% <0.00%> (-6.67%)	:arrow_down:
smdebug/core/singleton_utils.py	79.41% <0.00%> (-5.89%)	:arrow_down:
... and 25 more

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