chore: add 1.21.2 changelog

Katie Horne · Katie Horne · commit 38695bd78522 · 2021-08-26T14:56:59.000-05:00
diff --git a/changelog/1.21.2.md b/changelog/1.21.2.md
@@ -0,0 +1,25 @@
+---
+title: "1.21.2"
+description: "Released on 08/26/2021"
+---
+
+### Breaking changes ❗
+
+There are no breaking changes in 1.21.2.
+
+### Features ✨
+
+- infra: updated the Sysbox container runtime.
+- infra: upgraded the Docker Engine version to `20.10.8`.
+
+### Bug fixes 🐛
+
+> Coder v1.21.2 includes bug fixes backported from v1.22.0.
+
+- infra: fixed connection leak in Networking v2 when proxying browser traffic.
+- infra: re-enabled Go's `pprof` server on `localhost:6060` in the `coderd` pod.
+- infra: fixed Kubernetes watcher leak.
+
+### Security updates 🔐
+
+There are no security updates in 1.21.2.
