STCLI-195 pin webpack to ~5.68.0

[zburke]

Oy, the hits just keep coming. It seems that 5.69.0 and 5.70.0 don't
play nice with moment and barf thousands of lines of warnings into the
log when running tests, but 5.69.1 isn't compatible with
karma-webpack which prevents tests from running at all. Yuck.

Sample build output:

$ stripes test karma --karma.singleRun --karma.browsers ChromeDocker --karma.reporters mocha junit --coverage
Starting Karma tests...
01 04 [20](https://github.com/folio-org/stripes-core/runs/5789164817?check_suite_focus=true#step:13:20)[22](https://github.com/folio-org/stripes-core/runs/5789164817?check_suite_focus=true#step:13:22) 14:07:[29](https://github.com/folio-org/stripes-core/runs/5789164817?check_suite_focus=true#step:13:29).960:ERROR [plugin]: Cannot find plugin "karma-webpack".
  Did you forget to install it?
  npm install karma-webpack --save-dev
01 04 2022 14:07:30.187:ERROR [plugin]: Cannot load "webpack", it is not registered!
  Perhaps you are missing some plugin?
01 04 2022 14:07:30.188:ERROR [karma-server]: Server start failed on port 9876: Error: No provider for "framework:webpack"! (Resolving: framework:webpack)
Karma exited with 1
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
Error: Process completed with exit code 1.

Refs STCLI-195

[github-actions]

Jest Unit Test Statistics

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0 tests ±0  0 ✔️ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit f163733. ± Comparison against base commit ad6089a.

[github-actions]

BigTest Unit Test Statistics

0 files  ±0  0 suites  ±0   0s ⏱️ ±0s
0 tests ±0  0 ✔️ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit f163733. ± Comparison against base commit ad6089a.

[sonarqubecloud]

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