Documentation: Add v2.20.12 changelog (#12407)

* Changelog v2.20.12 - GHA

* Update changelog for version 2.20.12

Added security advisory for GHSA-96jx-fj7m-qh6x and fixed workflow saves and usermod/groupmod issues.

---------

Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: shamoon <4887959+shamoon@users.noreply.github.com>

docs/changelog.md

@@ -1,5 +1,32 @@
 # Changelog
 
+## paperless-ngx 2.20.12
+
+### Security
+
+-   Resolve [GHSA-96jx-fj7m-qh6x](https://github.com/paperless-ngx/paperless-ngx/security/advisories/GHSA-96jx-fj7m-qh6x)
+
+### Bug Fixes
+
+-   Fix: Scope the workflow saves to prevent clobbering filename/archive_filename [@stumpylog](https://github.com/stumpylog) ([#12390](https://github.com/paperless-ngx/paperless-ngx/pull/12390))
+-   Fix: don't try to usermod/groupmod when non-root + update docs (#<!---->12365) [@stumpylog](https://github.com/stumpylog) ([#12391](https://github.com/paperless-ngx/paperless-ngx/pull/12391))
+-   Fix: avoid moving files if already moved [@shamoon](https://github.com/shamoon) ([#12389](https://github.com/paperless-ngx/paperless-ngx/pull/12389))
+-   Fix: remove pagination from document notes api spec [@shamoon](https://github.com/shamoon) ([#12388](https://github.com/paperless-ngx/paperless-ngx/pull/12388))
+-   Fix: fix file button hover color in dark mode [@shamoon](https://github.com/shamoon) ([#12367](https://github.com/paperless-ngx/paperless-ngx/pull/12367))
+-   Fixhancement: only offer basic auth for appropriate requests [@shamoon](https://github.com/shamoon) ([#12362](https://github.com/paperless-ngx/paperless-ngx/pull/12362))
+
+### All App Changes
+
+<details>
+<summary>5 changes</summary>
+
+-   Fix: Scope the workflow saves to prevent clobbering filename/archive_filename [@stumpylog](https://github.com/stumpylog) ([#12390](https://github.com/paperless-ngx/paperless-ngx/pull/12390))
+-   Fix: avoid moving files if already moved [@shamoon](https://github.com/shamoon) ([#12389](https://github.com/paperless-ngx/paperless-ngx/pull/12389))
+-   Fix: remove pagination from document notes api spec [@shamoon](https://github.com/shamoon) ([#12388](https://github.com/paperless-ngx/paperless-ngx/pull/12388))
+-   Fix: fix file button hover color in dark mode [@shamoon](https://github.com/shamoon) ([#12367](https://github.com/paperless-ngx/paperless-ngx/pull/12367))
+-   Fixhancement: only offer basic auth for appropriate requests [@shamoon](https://github.com/shamoon) ([#12362](https://github.com/paperless-ngx/paperless-ngx/pull/12362))
+</details>
+
 ## paperless-ngx 2.20.11
 
 ### Security