Prepare changelog and release notes for 2.7.7 (#10233)

prepare 2.7.7 release notes and changelog

Author: trevorwhitney

CHANGELOG.md

@@ -36,6 +36,13 @@
 
 ### Dependencies
 
+## 2.7.7 (yyyy-mm-dd)
+
+##### Security
+
+* [10228](https://github.com/grafana/loki/pull/10228) *ashwanthgoli*: Fix CVE-2023-1255, CVE-2023-2650, CVE-2023-2975, CVE-2023-3446, CVE-2023-3817 and bump alpine image to 3.18.2
+* [10232](https://github.com/grafana/loki/pull/10232) *trevorwhitney*: Fix CVE-2022-41721
+
 ## 2.7.6 (yyyy-mm-dd)
 
 ##### Enhancements

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

@@ -33,6 +33,14 @@ As always, please read the [upgrade guide](../../upgrading/#270) before upgradin
 
 ## Bug fixes
 
+### 2.7.7 (2023-08-11)
+
+* Fix outstanding vulnerabilities: CVE-2023-1255, CVE-2023-2650, CVE-2023-2975, CVE-2023-3446, CVE-2023-3817, and CVE-2022-41721 and bump alpine image to 3.18.2
+
+### 2.7.6 (2023-07-24)
+
+* Expose optional label matcher for label values handler
+
 ### 2.7.5 (2023-03-28)
 
 * Flush buffered logger on exit: this makes sure logs are printed if Loki crashes on startup.