Bump django from 2.2 to 2.2.8

[dependabot[bot]]

Bumps django from 2.2 to 2.2.8.

Commits

- [`b8782c5`](https://github.com/django/django/commit/b8782c52c99175916a1dceaece758608ac5856d0) [2.2.x] Bumped version for 2.2.8 release. - [`d6fa509`](https://github.com/django/django/commit/d6fa50995261bf8863a4292845b95d396f43b507) [2.2.x] Added release dates for 2.1.15, 2.2.8 and 3.0. - [`36f580a`](https://github.com/django/django/commit/36f580a17f0b3cb087deadf3b65eea024f479c21) Fixed CVE-2019-19118 -- Required edit permissions on parent model for editabl... - [`70311e1`](https://github.com/django/django/commit/70311e1d00ef5b6bbbc8961eac81b5c814396a43) [2.2.x] Refs [#30953](https://github-redirect.dependabot.com/django/django/issues/30953) -- Added 2.1.15 release note for 0107e3d1058f653f66032f7f... - [`6cf3b6f`](https://github.com/django/django/commit/6cf3b6f5cf0cc3b11e86e511ec5201999913286f) [2.2.x] Fixed [#30953](https://github-redirect.dependabot.com/django/django/issues/30953) -- Made select_for_update() lock queryset's model when u... - [`9a17ae5`](https://github.com/django/django/commit/9a17ae50c61a3a0ea6c552ce4e3eab27f796d094) [2.2.x] Fixed [#31021](https://github-redirect.dependabot.com/django/django/issues/31021) -- Fixed proxy model permissions data migration crash wi... - [`019a1b9`](https://github.com/django/django/commit/019a1b9274c645db82593bc5898a279d134b464b) [2.2.x] Fixed [#31029](https://github-redirect.dependabot.com/django/django/issues/31029) -- Used more specific links to RFCs. - [`57f5a7e`](https://github.com/django/django/commit/57f5a7e36b514e078fc92f9014771f94b945acb4) [2.2.x] Refs [#31029](https://github-redirect.dependabot.com/django/django/issues/31029) -- Added note about :rfc: role in writing documentation d... - [`3cf70df`](https://github.com/django/django/commit/3cf70df468d4453fb315cb74db0232ac9a1e89be) [2.2.x] Fixed [#31018](https://github-redirect.dependabot.com/django/django/issues/31018) -- Removed django-nonrel in NoSQL databases FAQ. - [`e82a1bc`](https://github.com/django/django/commit/e82a1bcf622e5c9cf37f28bde21af8176b6dd118) [2.2.x] Improved custom MultiWidget example in docs. - Additional commits viewable in [compare view](https://github.com/django/django/compare/2.2...2.2.8)

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[chembl-bot]

I am going to a start test server for a74f7091a4d83b7c0f60f0ceee6a0b9da4b05049

[dependabot[bot]]

Superseded by #1234.