0.3.13 release (nebari-dev#852)

* Update RELEASE.md for 0.3.13 release

* Update version to 0.3.13

* Add Upcoming Release section back

* Fix typo

* Fix typo

* Update to 0.3.13 in various places

* Update qhub-dask references in docs

* Add to release.md

Release v0.3.12 - 06/30/2021

QHub version 0.3.11 release

QHub version 0.3.10 release

QHub version 0.3.9 release

QHub version 0.3.8 release

Pinning terraform modules version to release-0.3.7

Pinning terraform modules to release 0.3.6

Pin qhub-terraform-modules for 0.3.5 release

New release version for Qhub v0.3.4