Merge 2.0.1 backport branch into mainline master (#7842)

* Backport paritytech/substrate#7381

* Bring back genesis storage build in aura/timestamp

To not change spec version, see
https://github.com/paritytech/substrate/pull/7686#discussion_r540032743

* Backport paritytech/substrate#7238

* Backport paritytech/substrate#7395

* Bump impl_version

* Fix UI tests and bump trybuild dep

See https://github.com/rust-lang/rust/pull/73996

Backports:
https://github.com/paritytech/substrate/pull/7764
https://github.com/paritytech/substrate/pull/7656

* Partially backport paritytech/substrate#7838

* Release frame-support with a dep compilation fix

* Bump patch level for remaining crates

This is done because at the time of writing cargo-unleash does not fully
support partial workspace publishing and mixes both local and crates.io
versions of the packages, leading to errors in the release check workflow.

* Backport paritytech/substrate#7854

...to fix compilation error when using futures-* v0.3.9.

* Adding Changelog  entry for patch release

Co-authored-by: Bastian Köcher <git@kchr.de>
Co-authored-by: Benjamin Kampmann <ben@parity.io>

substrate/docs/CHANGELOG.md

@@ -6,6 +6,18 @@ The format is based on [Keep a Changelog].
 
 ## Unreleased
 
+## 2.0.0-> 2.0.1
+
+Patch release with backports to fix broken nightly builds.
+Namely contains backports of
+
+* [#7381: Make Substrate compile with latest nightly](https://github.com/paritytech/substrate/pull/7381)
+* [#7238: Fix compilation with environmental on latest nightly](https://github.com/paritytech/substrate/pull/7238)
+* [#7395: Make benchmarks compile with latest nightly](https://github.com/paritytech/substrate/pull/7395)
+* [#7838: Fix incorrect use of syn::exports](https://github.com/paritytech/substrate/pull/7838) (partially)
+* [#7854: Update to futures 0.3.9](https://github.com/paritytech/substrate/pull/7854)
+
+
 ## 2.0.0-rc6 -> 2.0.0 – two dot 😮
 
 Runtime