Update QuantConnect.pythonnet to 2.0.66

[jhonabreul]

Description

Updates the QuantConnect.pythonnet package reference to 2.0.66 in the 11 csproj files that consume it.

2.0.66 fixes del obj[key] on reflected .NET types crashing the process: QuantConnect/pythonnet#149. Deletion now works on IDictionary<K,V> and IList<T> implementers (Remove / RemoveAt, KeyError on a missing dictionary key) and raises TypeError on every other type, including arrays. Example that used to abort a Python algorithm: del self.runtime_statistics["MyKey"].

Companions: QuantConnect/LeanCloud.Services#257, QuantConnect/LeanCloud#1486.

Related Issue

N/A

Motivation and Context

Keeps LEAN on the latest QuantConnect.pythonnet and removes a process crash reachable from user Python algorithms.

Requires Documentation Change

No

How Has This Been Tested?

• With the 2.0.66 Python.Runtime.dll from the published package injected over Lean's test output (mirroring pythonnet's Lean CI workflows): Python regression algorithms 324/324 passed; Python unit tests 16600 passed / 0 failed / 9 skipped.
• A backtest doing del self.runtime_statistics[key] completes and removes the key.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• Refactor (non-breaking change which improves implementation)
• Performance (non-breaking change which improves performance. Please add associated performance test and results)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Non-functional change (xml comments/documentation/etc)

Checklist:

• My code follows the code style of this project.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.
• My branch follows the naming convention bug-<issue#>-<description> or feature-<issue#>-<description>