github actions update node version - changelog update (#5361)

* format

* updating node ver

* updating version

* updating eth2 ver

* update for e2e and unit tetss

* revert mosaic ver change

* revert

* changing set up node ver

* update node set up ver

* updating actions cache for node14

* update changelog

CHANGELOG.md

@@ -593,5 +593,6 @@ Released with 1.0.0-beta.37 code base.
 
 ### Fixed
 -  Browser builds support polyfills (#5031) (#5053) (#4659) (#4767)
+-  Update node version on actions to fix breaking mosaic test (#5354) 
 -  Start incrementing jsonrpc.id from random number (#5327)
 -  `web3-eth-contract`'s `call` and `send` methods no longer mutate `options` argument (#5394)