Cleanup old django middleware_classes and pin docker versions

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.12 :tada:

Comparison is base (2266637) 73.34% compared to head (8d579b6) 73.46%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #368 +/- ## ========================================== + Coverage 73.34% 73.46% +0.12% ========================================== Files 123 123 Lines 4277 4270 -7 Branches 528 526 -2 ========================================== Hits 3137 3137 + Misses 1006 999 -7 Partials 134 134 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `73.44% <0.00%> (+0.12%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wooey#carryforward-flags-in-the-pull-request-comment) to find out more. | [Impacted Files](https://codecov.io/gh/wooey/Wooey/pull/368?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wooey) | Coverage Δ | | |---|---|---| | [...ey/conf/project\_template/settings/user\_settings.py](https://codecov.io/gh/wooey/Wooey/pull/368?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wooey#diff-d29vZXkvY29uZi9wcm9qZWN0X3RlbXBsYXRlL3NldHRpbmdzL3VzZXJfc2V0dGluZ3MucHk=) | `0.00% <ø> (ø)` | | | [...y/conf/project\_template/settings/wooey\_settings.py](https://codecov.io/gh/wooey/Wooey/pull/368?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wooey#diff-d29vZXkvY29uZi9wcm9qZWN0X3RlbXBsYXRlL3NldHRpbmdzL3dvb2V5X3NldHRpbmdzLnB5) | `0.00% <0.00%> (ø)` | |

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