Prep v0.6.0 release.

[andrewsomething]

We've been busy. Lots of things to release!

$ github-changelog-generator -org digitalocean -repo pydo -token $GH_TOKEN

• [DBAAS] | Add API endpoint for applying cluster patches #332 - @vsharma6855 - [DBAAS] | Add API endpoint for applying cluster patches
• [bot] actions: in-line region_slug property.: Re-Generated From digitalocean/openapi@ca3e2ac #365 - @digitalocean-engineering - [bot] actions: in-line region_slug property.: Re-Generated From digitalocean/openapi@ca3e2ac
• [bot] Update two parameters to writeable during DOKS create: Re-Generated From digitalocean/openapi@b93070a #364 - @digitalocean-engineering - [bot] Update two parameters to writeable during DOKS create: Re-Generated From digitalocean/openapi@b93070a
• [bot] Add field for internal load balancers: Re-Generated From digitalocean/openapi@2e3fed1 #363 - @digitalocean-engineering - [bot] Add field for internal load balancers: Re-Generated From digitalocean/openapi@2e3fed1
• [bot] vpcs: update operationId for vpcs_update_peerings: Re-Generated From digitalocean/openapi@b78970b #362 - @digitalocean-engineering - [bot] vpcs: update operationId for vpcs_update_peerings: Re-Generated From digitalocean/openapi@b78970b
• [bot] [databases]: update opensearch ism_history_max_docs max: Re-Generated From digitalocean/openapi@e67d14f #360 - @digitalocean-engineering - [bot] [databases]: update opensearch ism_history_max_docs max: Re-Generated From digitalocean/openapi@e67d14f
• readthedocs: Set python version to 3.8 in .readthedocs.yaml #359 - @andrewsomething - readthedocs: Set python version to 3.8 in .readthedocs.yaml
• readthedocs: Export dev dependencies in requirements.txt #358 - @andrewsomething - readthedocs: Export dev dependencies in requirements.txt
• [bot] [databases]: add a missing field to Opensearch advanced configuration: Re-Generated From digitalocean/openapi@19d4c1a #357 - @digitalocean-engineering - [bot] [databases]: add a missing field to Opensearch advanced configuration: Re-Generated From digitalocean/openapi@19d4c1a
• [bot] Fix more docs links: Re-Generated From digitalocean/openapi@a2a70d7 #356 - @digitalocean-engineering - [bot] Fix more docs links: Re-Generated From digitalocean/openapi@a2a70d7
• [bot] Fix outdated docs links: Re-Generated From digitalocean/openapi@e557785 #355 - @digitalocean-engineering - [bot] Fix outdated docs links: Re-Generated From digitalocean/openapi@e557785
• [bot] CDN rate limit clarification: Re-Generated From digitalocean/openapi@2841ebe #354 - @digitalocean-engineering - [bot] CDN rate limit clarification: Re-Generated From digitalocean/openapi@2841ebe
• test: list supported backup policies #353 - @gagan-bhullar-tech - test: list supported backup policies
• test: list backup policies #352 - @gagan-bhullar-tech - test: list backup policies
• test: database clusters metrics credentials #350 - @AryanBakliwal - test: database clusters metrics credentials
• test: install update mock #349 - @gagan-bhullar-tech - test: install update mock
• test: get backup policy test #351 - @gagan-bhullar-tech - test: get backup policy test
• test: update user mock #348 - @gagan-bhullar-tech - test: update user mock
• [bot] API changes for GPU Droplets: Re-Generated From digitalocean/openapi@c90af3a #343 - @digitalocean-engineering - [bot] API changes for GPU Droplets: Re-Generated From digitalocean/openapi@c90af3a
• [bot] PDOCS-2719: Clarify lbaas/tls_connections_per_second_utilization_percent alert requirements: Re-Generated From digitalocean/openapi@48fb93a #338 - @digitalocean-engineering - [bot] PDOCS-2719: Clarify lbaas/tls_connections_per_second_utilization_percent alert requirements: Re-Generated From digitalocean/openapi@48fb93a