Upgrade to Janus 1.3.2 (#1901)

Resolves tiny-pilot/tinypilot-pro#1494

This PR makes use of the latest Janus and uStreamer Debian packages.

For testing on device, you can download and install the latest TinyPilot
bundle artifact from this PR's CircleCI workflow:

```bash
curl \
  --silent \
  --show-error \
  --location \
  https://raw.githubusercontent.com/tiny-pilot/tinypilot/master/dev-scripts/device/install-bundle | \
  sudo bash -s -- \
    path-to-bundle-file
```

Notes:
- This PR also upgrades the JavaScript dependencies related to Janus
(i.e., `janus.js` & `webrtc-adapter/adapter.js`) based on the versions
pinned in the [Janus `1.3.2`
demos](https://github.com/meetecho/janus-gateway/blob/v1.3.2/html/demos/streaming.html#L8).
- This PR also renames the Debian build directory name to be consistent
with the resulting Debian package file name (i.e.,
[`<DebianPackageName>_<VersionNumber>-<DebianRevisionNumber>_<DebianArchitecture>.deb`](https://www.debian.org/doc/manuals/debian-faq/pkg-basics.en.html#pkgname)).
This is non-functional change.

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Author: jdeanwallace

app/license_notice.py

@@ -44,7 +44,7 @@ class LicenseMetadata:
         name='Janus',
         homepage_url='https://janus.conf.meetecho.com',
         license_url=
-        'https://raw.githubusercontent.com/meetecho/janus-gateway/v1.0.1/COPYING'
+        'https://raw.githubusercontent.com/meetecho/janus-gateway/v1.3.2/COPYING'
     ),
 
     # JavaScript dependencies.