Docs: Add release notes for 2.7.4 (#8629)

**What this PR does / why we need it**:
Add release notes for v2.7.4

docs/sources/release-notes/v2-7.md

@@ -33,6 +33,18 @@ As always, please read the [upgrade guide](../../upgrading/#270) before upgradin
 
 ## Bug fixes
 
+### 2.7.4 (2023-02-24)
+
+* Fixed different streams for `cri` tags ending on the same stream.
+* Fixed the `userdata` field (from Windows Event Log) being scraped incorrectly.
+* Fixed `vector()` function producing wrong timestamp.
+* Fixed behavior for overlapping chunks with multiple stores.
+* Fixed logs results caching causing query-frontend to return logs outside of query window.
+* Fixed panics when:
+  * `/scheduler/ring` endpoint is requested with scheduler ring disabled.
+  * LogQL clones a specific query.
+  * Promtail deals with invalid calls to `Details()`.
+
 ### 2.7.3 (2023-02-01)
 
 * Fixed a bug in compactor that caused divide-by-zero panics when `startTime` and `endTime` of a delete request were equal.