Add perian dependency for PERIAN plugin

[neverett]

Why are the changes needed?

The perian plugin depends on the perian package; in order to build flytekit docs about the perian plugin, we need to include that package in the docs requirements.

What changes were proposed in this pull request?

Adds perian package to monodocs-requirements.yaml and updates monodocs-requirements.lock.yaml with new dependency.

How was this patch tested?

Tested building docs locally with updated monodocs environment and FLYTEKIT_LOCAL_PATH set to @otarabai fork of flytekit that includes perian plugin docs updates.

Screenshots

Local docs build:

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Related PRs

flyteorg/flytekit#2816

Docs link

https://flyte--5848.org.readthedocs.build/en/5848/ (Note: this is just to demonstrate that the docs build with the new dependency -- the perian flytekit docs won't be in this build because they're currently in a fork.)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.34%. Comparing base (f2a0619) to head (5fccc67).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5848   +/-   ##
=======================================
  Coverage   36.33%   36.34%           
=======================================
  Files        1304     1304           
  Lines      110137   110137           
=======================================
+ Hits        40023    40029    +6     
+ Misses      65946    65940    -6     
  Partials     4168     4168           

Flag	Coverage Δ
unittests-datacatalog	51.37% <ø> (ø)
unittests-flyteadmin	55.60% <ø> (+0.03%)	⬆️
unittests-flytecopilot	12.17% <ø> (ø)
unittests-flytectl	62.21% <ø> (ø)
unittests-flyteidl	7.14% <ø> (ø)
unittests-flyteplugins	53.35% <ø> (ø)
unittests-flytepropeller	42.02% <ø> (ø)
unittests-flytestdlib	55.31% <ø> (ø)

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.