Update dependency dynaconf to v3

This MR contains the following updates:

Package	Type	Update	Change
dynaconf	dependencies	major	^2.0 -> ^3.1

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This MR has been generated by Renovate Bot.

From changelogs Dynaconf is now envless by default

We should update docs and example config.

added 3 commits

• d5719155...b55b83c0 - 2 commits from branch master
• b61d111d - Update dependency dynaconf to v3

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added 15 commits

• b61d111d...297fdc37 - 14 commits from branch master
• 2a20a712 - Update dependency dynaconf to v3

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added 3 commits

• 2a20a712...692a99f1 - 2 commits from branch master
• d767fd75 - Update dependency dynaconf to v3

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marked as a Work In Progress

changed the description

unmarked as a Work In Progress

changed the description

added 56 commits

• d767fd75...b775350f - 55 commits from branch master
• 3ca33dad - Update dependency dynaconf to v3

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marked as a Work In Progress

unmarked as a Work In Progress

added 6 commits

• 3ca33dad...26bc2cc2 - 5 commits from branch master
• 0a5edc6c - Update dependency dynaconf to v3

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added 1 commit

• 71c346ea - Update dependency dynaconf to v3

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changed the description

added 5 commits

• 71c346ea...ee021d1d - 4 commits from branch master
• 10fb42ef - Update dependency dynaconf to v3

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Artifact update problem

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The artifact failure details are included below:

File name: poetry.lock

Creating virtualenv aleksis-NrJg8Blb-py3.8 in /home/ubuntu/.cache/pypoetry/virtualenvs
Updating dependencies
Resolving dependencies...

[SolverProblemError]
Because no versions of django-two-factor-auth match >1.11.0,<1.12 || >1.12,<1.12.1 || >1.12.1,<2.0.0
 and django-two-factor-auth (1.11.0) depends on django-otp (>=0.6.0,<0.99), django-two-factor-auth (>=1.11.0,<1.12 || >1.12,<1.12.1 || >1.12.1,<2.0.0) requires django-otp (>=0.6.0,<0.99).
And because django-two-factor-auth (1.12) depends on django-otp (>=0.6.0,<0.99)
 and django-two-factor-auth (1.12.1) depends on django-otp (>=0.6.0,<0.99), django-two-factor-auth (>=1.11.0,<2.0.0) requires django-otp (>=0.6.0,<0.99).
So, because aleksis depends on both django-two-factor-auth (^1.11.0) and django-otp (1.0.0), version solving failed.

added 24 commits

• 10fb42ef...060e8cb7 - 22 commits from branch master
• 224dd2c4 - Merge branch 'master' into renovate/dynaconf-3.x
• 9bf29adb - Make dynaconf envless in docs

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resolved all threads

added 1 commit

• 04190bd1 - Update lockfile

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assigned to @nik