Add v1.4.2 release notes

Author: inancgumus

release notes/v1.4.2.md

@@ -0,0 +1,5 @@
+k6 `v1.4.2` is here 🎉!
+
+This is a patch release that includes:
+- [#5439](https://github.com/grafana/k6/pull/5439) Fix loading files with spaces in their paths
+- [#5415](https://github.com/grafana/k6/pull/5415) Updates Sobek to fix [the _unexpected token class_ issue](https://github.com/dop251/goja/issues/688)