Prepare for (pre) release: v5.6.0b2 (#9938)

* Bump version: 5.6.0b1 → 5.6.0b2

* Added Changelog for v5.6.0b2

* Remove Python 3.8 support from the release docs and update Kombu to v5.6.0rc2 (minimum version)

Prepare for (pre) release: v5.6.0b1 (#9890)

* Bump version: 5.5.3 → 5.6.0b1

* Immunity -> Recovery

* Added Changelog for v5.6.0b1

Prepare for release: v5.5.3 (#9732)

* Bump version: 5.5.2 → 5.5.3

* Added Changelog for v5.5.3

Prepare for release: v5.5.2 (#9675)

* Bump version: 5.5.1 → 5.5.2

* Added Changelog for v5.5.2

Prepare for release: v5.5.1 (#9660)

* Bump version: 5.5.0 → 5.5.1

* Added Changelog for v5.5.1

Prepare for release: v5.5.0 (#9644)

* Added Changelog for v5.5.0

* Bump version: 5.5.0rc5 → 5.5.0

Prepare for (pre) release: v5.5.0rc5 (#9582)

* Bump version: 5.5.0rc4 → 5.5.0rc5

* Added Changelog for v5.5.0rc5

Prepare for (pre) release: v5.5.0rc4 (#9474)

* Bump version: 5.5.0rc3 → 5.5.0rc4

* Added Changelog for v5.5.0rc4

Prepare for (pre) release: v5.5.0rc3 (#9450)

* Bump version: 5.5.0rc2 → 5.5.0rc3

* Added Changelog for v5.5.0rc3

Prepare for (pre) release: v5.5.0rc2 (#9416)

* Bump version: 5.5.0rc1 → 5.5.0rc2

* Added Changelog for v5.5.0rc2