Update django-pipeline to latest

[phillxnet]

Our remaining "RemovedInDjango31Warning: CachedStaticFilesStorage is deprecated in favor of ManifestStaticFilesStorage" appears to be related to our currently pinned version django-pipeline, limited at the time to 1.7 due to our older Django. See: #2646 by @FroggyFlox :

It is thus proposed that we temporarily upgrade to django-pipeline 1.7 now, before further upgrading during our move to Django 2.2 LTS, for which support was added in jazzband/django-pipeline#693 (thanks to @phillxnet for finding that last one).

And we have the following in their changelog for 2.0.1:
https://github.com/jazzband/django-pipeline/blob/master/HISTORY.rst#201

• Add subclass of ManifestStaticFilesStorage. Thank to @jhpinson
• Change the documentation to use PipelineManifestStorage in configuration instead of PipelineCachedStorage now deprecated.
• ...

https://github.com/jazzband/django-pipeline/blob/master/HISTORY.rst#207

• Added Django 3.2 compatibility (Thanks to @jramnai in Add detail view to scheduled tasks #751)

https://pypi.org/project/django-pipeline/2.0.9/
is the last to specifically mention Py3.6 however no specific dropping of Py3.6 has yet been found: still looking!

Current is 2.1.0: https://pypi.org/project/django-pipeline/

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This issue is a follow-up to #2646 re our pending now merged in testing "Provisional Django 2.2 LTS update" #2625 (part of Milestone: https://github.com/rockstor/rockstor-core/milestone/22 ) and is a spin-off from the latter issue pertaining to comment: #2625 (comment)

[phillxnet]

It is proposed that we can now un-pin this dependency, allowing it to move with our ongoing Django Py updates. The latest version on PyPi indicates Django 2.2 and Py3.9 compatibility.

[phillxnet]

django-pipeline = "==1.7.0" # last version listed with Python 3.6 and Django 1.11 compatibility

We were previously held back to 1.7.0 by both our Python and Django versions.

lbuildvm:/opt/rockstor # poetry update
Updating dependencies
Resolving dependencies... (1.5s)

Writing lock file

Package operations: 0 installs, 1 update, 0 removals

  • Updating django-pipeline (1.7.0 -> 2.1.0)

[phillxnet]

Closing as:
Fixed by #2694