Add deprecations to changelog categories (#5162)

### Description
<!-- What changed and why? -->

#### Issues
<!--
* resolves: #1234
* resolves: LIN-1234
-->

#### Reminders
- Please add tests to validate your changes, and lint your code using
`tox -e linters`.
- Add GH Issue ID _&_ Linear ID (if applicable)
- PR title should use [conventional
commit](https://develop.sentry.dev/engineering-practices/commit-messages/#type)
style (`feat:`, `fix:`, `ref:`, `meta:`)
- For external contributors:
[CONTRIBUTING.md](https://github.com/getsentry/sentry-python/blob/master/CONTRIBUTING.md),
[Sentry SDK development docs](https://develop.sentry.dev/sdk/), [Discord
community](https://discord.gg/Ww9hbqr)

Author: sentrivana

.github/release.yml

@@ -15,6 +15,9 @@ changelog:
       labels:
         - "Changelog: Bugfix"
         - Bug
+    - title: Deprecations 🏗️
+      labels:
+        - "Changelog: Deprecation"
     - title: Documentation 📚
       labels:
         - "Changelog: Docs"