Create Release Notes for 1.6

[danuw]

What happened?

Create a PR with updated change log.
Will look for PRs and Issues since last release.

Please feel free to add anything missing in the comments...

I used the following commands to help

gh pr list -R Green-Software-Foundation/carbon-aware-sdk --search "-label:agenda label:v1.6 is:closed " --json number,title,url --template \
        '{{range .}}{{ printf "\n-[PR #%v]" .number | autocolor "green"}} {{.title}} {{ printf "](%v)" .url}}{{end}}'

gh issue list -R Green-Software-Foundation/carbon-aware-sdk --search "-label:agenda label:v1.6 is:closed" --json number,title,url --template \
        '{{range .}}{{ printf "\n-[#%v]" .number | autocolor "green"}} {{.title}} {{ printf "](%v)" .url}}{{end}}'

Code of Conduct

• I agree to follow this project's Code of Conduct

Feature Commitment

• I commit to contributing this feature as a PR and working with the GSF to merge this feature into the Carbon Aware SDK.

[danuw]

• [PR Add a configuration for disabling to cache JSON emission data #555] Add a configuration for disabling to cache JSON emission data ](Add a configuration for disabling to cache JSON emission data #555)
• [PR Documentation: "it's" is used incorrectly several times #553] Documentation: "it's" is used incorrectly several times ](Documentation: "it's" is used incorrectly several times #553)
• [PR Docs/blog update for releases 1.3 to1.5 and fix #551] Docs/blog update for releases 1.3 to1.5 and fix ](Docs/blog update for releases 1.3 to1.5 and fix #551)
• [PR Add env directive to values.yaml and troubleshooting guide to avoid inotify limitation on Linux #544] Add env directive to values.yaml and troubleshooting guide to avoid inotify limitation on Linux ](Add env directive to values.yaml and troubleshooting guide to avoid inotify limitation on Linux #544)
• [PR Add blog article for .NET 8 upgrade #524] Add blog article for .NET 8 upgrade ](Add blog article for .NET 8 upgrade #524)
• [PR documentation-change.yml: Created issue template for documentation ch… #523] documentation-change.yml: Created issue template for documentation ch… ](documentation-change.yml: Created issue template for documentation ch… #523)
• [[Bug]: Avoid inotify limit in WebAPI container on Kubernetes #528] [Bug]: Avoid inotify limit in WebAPI container on Kubernetes ]([Bug]: Avoid inotify limit in WebAPI container on Kubernetes #528)