v0.15.1

Fixes bugs related to missing global pooling in controlnet, img2img processor issue with safety checker, uneven timesteps and better config deprecation

• [Bug fix] Add global pooling to controlnet by @patrickvonplaten in #3121
• [Bug fix] Fix img2img processor with safety checker by @patrickvonplaten in #3127
• [Bug fix] Make sure correct timesteps are chosen for img2img by @patrickvonplaten in #3128
• [Bug fix] Fix config deprecation by @patrickvonplaten in #3129