Update dependency meetecho/janus-gateway to v1.2.1 (#122)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [meetecho/janus-gateway](https://github.com/meetecho/janus-gateway) | minor | `v1.1.4` -> `v1.2.1` |

---

### Release Notes

<details>
<summary>meetecho/janus-gateway (meetecho/janus-gateway)</summary>

### [`v1.2.1`](https://github.com/meetecho/janus-gateway/blob/HEAD/CHANGELOG.md#v121---2023-12-06)

[Compare Source](meetecho/janus-gateway@v1.2.0...v1.2.1)

-   Added support for abs-capture-time RTP extension \[[PR-3161](meetecho/janus-gateway#3161)]
-   Fixed truncated label in datachannels (thanks [@&#8203;veeting](https://github.com/veeting)!) \[[PR-3265](meetecho/janus-gateway#3265)]
-   Support larger values for SDP attributes (thanks [@&#8203;petarminchev](https://github.com/petarminchev)!) \[[PR-3282](meetecho/janus-gateway#3282)]
-   Fixed rare crash in VideoRoom plugin (thanks [@&#8203;tmatth](https://github.com/tmatth)!) \[[PR-3259](meetecho/janus-gateway#3259)]
-   Don't create VideoRoom subscriptions to publisher streams with no associated codecs
-   Added suspend/resume participant API to AudioBridge \[[PR-3301](meetecho/janus-gateway#3301)]
-   Fixed rare crash in AudioBridge
-   Fixed rare crash in Streaming plugin when doing ICE restarts \[[Issue-3288](meetecho/janus-gateway#3288)]
-   Allow SIP and NoSIP plugins to bind media to a specific address (thanks [@&#8203;pawnnail](https://github.com/pawnnail)!) \[[PR-3263](meetecho/janus-gateway#3263)]
-   Removed advertised support for SIP UPDATE in SIP plugin
-   Parse RFC2833 DTMF to custom events in SIP plugin (thanks [@&#8203;ywmoyue](https://github.com/ywmoyue)!) \[[PR-3280](meetecho/janus-gateway#3280)]
-   Fixed missing Contact header in some dialogs in SIP plugin (thanks [@&#8203;ycherniavskyi](https://github.com/ycherniavskyi)!) \[[PR-3286](meetecho/janus-gateway#3286)]
-   Properly set mid when notifying about ended tracks in janus.js
-   Fixed broken restamping in janus-pp-rec
-   Other smaller fixes and improvements (thanks to all who contributed pull requests and reported issues!)

### [`v1.2.0`](https://github.com/meetecho/janus-gateway/blob/HEAD/CHANGELOG.md#v120---2023-08-09)

[Compare Source](meetecho/janus-gateway@v1.1.4...v1.2.0)

-   Added support for VP9/AV1 simulcast, and fixed broken AV1/SVC support \[[PR-3218](meetecho/janus-gateway#3218)]
-   Fixed RTCP out quality stats \[[PR-3228](meetecho/janus-gateway#3228)]
-   Default link quality stats to 100
-   Added support for ICE consent freshness \[[PR-3234](meetecho/janus-gateway#3234)]
-   Fixed rare race condition in VideoRoom \[[PR-3219](meetecho/janus-gateway#3219)] \[[PR-3247](meetecho/janus-gateway#3247)]
-   Use speexdsp's jitter buffer in the AudioBridge \[[PR-3233](meetecho/janus-gateway#3233)]
-   Fixed crash in Streaming plugin on mountpoints with too many streams \[[Issue-3225](meetecho/janus-gateway#3225)]
-   Support for batched configure requests in Streaming plugin (thanks [@&#8203;petarminchev](https://github.com/petarminchev)!) \[[PR-3239](meetecho/janus-gateway#3239)]
-   Fixed rare deadlock in Streamin plugin \[[PR-3250](meetecho/janus-gateway#3250)]
-   Fix simulated leave message for longer string ID rooms in TextRoom (thanks [@&#8203;adnanel](https://github.com/adnanel)!) [PR-3243](meetecho/janus-gateway#3243)]
-   Notify about count of sessions, handles and PeerConnections on a regular basis, when event handlers are enabled \[[PR-3221](meetecho/janus-gateway#3221)]
-   Fixed broken Insertable Streams for recvonly streams when answering in janus.js
-   Added background selector and blur support to Virtual Background demo
-   Other smaller fixes and improvements (thanks to all who contributed pull requests and reported issues!)

</details>

---

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Reviewed-on: https://git.walbeck.it/walbeck-it/docker-janus-gateway/pulls/122
Co-authored-by: renovate-bot <bot@walbeck.it>
Co-committed-by: renovate-bot <bot@walbeck.it>

Dockerfile

@@ -1,7 +1,7 @@
 FROM debian:bullseye-slim@sha256:5aab272aa24713622bfac9dba239bc7488d9979b0d82d19a9dffccd99292154d
 
 # renovate: datasource=github-tags depName=meetecho/janus-gateway versioning=semver
-ENV JANUS_VERSION v1.1.4
+ENV JANUS_VERSION v1.2.1
 # renovate: datasource=github-tags depName=cisco/libsrtp versioning=semver
 ENV LIBSRTP_VERSION v2.5.0
 # renovate: datasource=git-tags depName=https://gitlab.freedesktop.org/libnice/libnice versioning=semver