[ci skip] Update changelog and version for nightly build: v1.39.0-84-nightly.

CHANGELOG.md

@@ -6,6 +6,7 @@
 
 **Merged pull requests:**
 
+- Percentage of group aggregatable at cloud - fixed for backwards compatibility [\#15126](https://github.com/netdata/netdata/pull/15126) ([ktsaou](https://github.com/ktsaou))
 - Fix package versioning issues. [\#15125](https://github.com/netdata/netdata/pull/15125) ([Ferroin](https://github.com/Ferroin))
 - Revert "percentage of group is now aggregatable at cloud across multiple nodes" [\#15122](https://github.com/netdata/netdata/pull/15122) ([ktsaou](https://github.com/ktsaou))
 - Fix handling of eBPF plugin for DEB packages. [\#15117](https://github.com/netdata/netdata/pull/15117) ([Ferroin](https://github.com/Ferroin))

packaging/version

@@ -1 +1 @@
-v1.39.0-82-nightly
+v1.39.0-84-nightly