chore(deps): bump coder/coder from v2.11.2 to v2.12.1 in /render (#144)

Bumps [coder/coder](https://github.com/coder/coder) from v2.11.2 to v2.12.1.
- [Release notes](https://github.com/coder/coder/releases)
- [Changelog](https://github.com/coder/coder/blob/main/release.key)
- [Commits](coder/coder@v2.11.2...v2.12.1)

---
updated-dependencies:
- dependency-name: coder/coder
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

render/Dockerfile

@@ -1,4 +1,4 @@
-FROM ghcr.io/coder/coder:v2.11.2
+FROM ghcr.io/coder/coder:v2.12.1
 ARG RENDER_EXTERNAL_URL
 ENV CODER_HTTP_ADDRESS=0.0.0.0:3000
 ENV CODER_ACCESS_URL=${RENDER_EXTERNAL_URL}