Bump django from 2.0.9 to 2.0.12

[dependabot[bot]]

Bumps django from 2.0.9 to 2.0.12.

Commits

• 6d0a300 [2.0.x] Bumped version for 2.0.12 release.
• 11485a3 [2.0.x] Refs #30175 -- Added release notes for 2.0.12, and 1.11.20 releases.
• be439e5 [2.0.x] Bumped version for 2.0.11 release.
• 1f42f82 [2.0.x] Fixed CVE-2019-6975 -- Fixed memory exhaustion in utils.numberformat....
• f6f0f52 [2.0.x] Removed extra characters in docs header underlines.
• cfadb0e [2.0.x] Added stub release notes for security releases.
• 071238f [2.0.x] Fixed duplicate word in docs/releases/2.0.txt.
• c89ab95 [2.0.x] Used extlinks for GitHub commits.
• ab5fc25 [2.0.x] Replaced CVE/ticket roles with extlinks.
• 9518450 [2.0.x] Fixed E117 and F405 flake8 warnings.
• Additional commits viewable in compare view

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[dependabot[bot]]

A newer version of django exists, but since this PR has been edited by someone other than Dependabot I haven't updated it. You'll get a PR for the updated version as normal once this PR is merged.