chore(release-notes): add release notes for 8.2.3 and 7.5.12 (#42987)

* chore(release-notes): add release notes for 8.2.3 and 7.5.12

* chore(release-notes): add release notes to the index

* chore(release-notes): add release notes to index and changelog

* chore(release-notes): add release notes to index and changelog

* chore(latest.json): bump

docs/sources/release-notes/_index.md

@@ -8,6 +8,7 @@ weight = 10000
 Here you can find detailed release notes that list everything that is included in every release as well as notices
 about deprecations, breaking changes as well as changes that relate to plugin development.
 
+- [Release notes for 8.3.2]({{< relref "release-notes-8-3-2" >}})
 - [Release notes for 8.3.1]({{< relref "release-notes-8-3-1" >}})
 - [Release notes for 8.3.0]({{< relref "release-notes-8-3-0" >}})
 - [Release notes for 8.3.0-beta2]({{< relref "release-notes-8-3-0-beta2" >}})
@@ -45,6 +46,7 @@ about deprecations, breaking changes as well as changes that relate to plugin de
 - [Release notes for 8.0.0-beta3]({{< relref "release-notes-8-0-0-beta3" >}})
 - [Release notes for 8.0.0-beta2]({{< relref "release-notes-8-0-0-beta2" >}})
 - [Release notes for 8.0.0-beta1]({{< relref "release-notes-8-0-0-beta1" >}})
+- [Release notes for 7.5.12]({{< relref "release-notes-7-5-12" >}})
 - [Release notes for 7.5.11]({{< relref "release-notes-7-5-11" >}})
 - [Release notes for 7.5.10]({{< relref "release-notes-7-5-10" >}})
 - [Release notes for 7.5.9]({{< relref "release-notes-7-5-9" >}})

docs/sources/release-notes/release-notes-7-5-12.md

@@ -0,0 +1,13 @@
++++
+title = "Release notes for Grafana 7.5.12"
+[_build]
+list = false
++++
+
+<!-- Auto generated by update changelog github action -->
+
+# Release notes for Grafana 7.5.12
+
+### Bug fixes
+
+- **Security**: Fixes CVE-2021-43813 and CVE-2021-PENDING. For more information, see our [blog](https://grafana.com/blog/2021/12/10/grafana-8.3.2-and-7.5.12-released-with-moderate-severity-security-fix/)

docs/sources/release-notes/release-notes-8-3-2.md

@@ -0,0 +1,13 @@
++++
+title = "Release notes for Grafana 8.3.2"
+[_build]
+list = false
++++
+
+<!-- Auto generated by update changelog github action -->
+
+# Release notes for Grafana 8.3.2
+
+### Bug fixes
+
+- **Security**: Fixes CVE-2021-43813 and CVE-2021-PENDING. For more information, see our [blog](https://grafana.com/blog/2021/12/10/grafana-8.3.2-and-7.5.12-released-with-moderate-severity-security-fix/)