Update dependency django-maintenance-mode to ^0.15.0

This MR contains the following updates:

Package	Type	Update	Change
django-maintenance-mode	dependencies	minor	^0.14.0 -> ^0.15.0

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This MR has been generated by Renovate Bot.

Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this MR as-is.

Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you check the rebase/retry checkbox if found above, or
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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.

marked the checklist item If you want to rebase/retry this MR, check this box as completed

added 22 commits

• 7913ee01...060e8cb7 - 20 commits from branch master
• f9d27856 - Merge branch 'master' into renovate/django-maintenance-mode-0.x
• 3726caf4 - Update lockfile

Compare with previous version

assigned to @nik

approved this merge request

mentioned in issue #301 (closed)

added 4 commits

• 3726caf4...de9c4236 - 3 commits from branch master
• fa1faba6 - Merge branch 'master' into renovate/django-maintenance-mode-0.x

Compare with previous version

enabled an automatic merge when the pipeline for fa1faba6 succeeds

merged

mentioned in commit 344614da

assigned to @debdolph and unassigned @nik