meta(changelog): Update changelog for 7.120.4-alpha.1 (#17205)

Another try

Author: s1gr1d

CHANGELOG.md

@@ -4,6 +4,10 @@
 
 - "You miss 100 percent of the chances you don't take. — Wayne Gretzky" — Michael Scott
 
+## 7.120.4-alpha.1
+
+No user-facing changes, only internal changes.
+
 ## 7.120.4-alpha.0
 
 - fix(v7/cdn): Stop using `Object.assign` to be ES5 compatible (#17080)