{release} v3.6.0rc6 (#5467)

## What type of PR is this? (check all applicable)

Release v3.6.0rc6

## Have you discussed this change with the InvokeAI team?
- [X] Yes
- [ ] No, because:

      
## Have you updated all relevant documentation?
- [X] Yes
- [ ] No


## Description
Release candidate $6 

## QA Instructions, Screenshots, Recordings

[InvokeAI-installer-v3.6.0rc6.zip](https://github.com/invoke-ai/InvokeAI/files/13890206/InvokeAI-installer-v3.6.0rc6.zip)



## Merge Plan
Merge when approved

## [optional] Are there any post deployment tasks we need to perform?
Release on PyPi & Github

Author: Millu

invokeai/version/invokeai_version.py

@@ -1 +1 @@
-__version__ = "3.6.0rc5"
+__version__ = "3.6.0rc6"