2.6.2 Hotfix - Update RestSharp and Greg

[QilongTang]

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Purpose

Hotfix 2.6.2 - update Greg and RestSharp

Declarations

Check these if you believe they are true

• The codebase is in a better state after this PR
• Is documented according to the standards
• The level of testing this PR includes is appropriate
• User facing strings, if any, are extracted into *.resx files
• All tests pass using the self-service CI.
• Snapshot of UI changes, if any.
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.
• This PR modifies some build requirements and the readme is updated

Release Notes

Hotfix - update Greg and RestSharp

Reviewers

@DynamoDS/dynamo

FYIs

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[QilongTang]

Currently blocked with one build error that Greg.Requests.Hosts public class is missing from target dll. This is actually breaking API backward compatibility. Looking for more insights from Turbo Team. FYI: @pinzart @jasonstratton

[QilongTang]

This is now ready for review, once merged, this can be cherry-picked to 2.3.2. Thanks @pinzart @mjkkirschner for the Greg update again. I have verified locally Dynamo 2.6.2 can be built and launched normally with pm working

[QilongTang]

Thanks @pinzart, this branch now builds correctly, except for ASM grabbing which is not part of this repo

Thanks @reddyashish for the review, merging