Update fcs 43 7 300

[TheAngryByrd]

WHAT

🤖 Generated by Copilot at e5453e5

Updated the project to use the latest F# compiler version and fixed some cross-platform and test issues. Added a ChangeExtensionShim method to FileSystem.fs and updated some AST cases in UntypedAstUtils.fs and UnionPatternMatchCaseGenerator.fs. Fixed a line number error in CompletionTests.fs.

🤖 Generated by Copilot at e5453e5

FileSystem shim
Cross-platform extension fix
Autumn compatibility

📁🔧🆙

WHY

FCS 43.7.300 has been available for a bit.

Merge from the last commit that deal with 43.7.300-*

HOW

🤖 Generated by Copilot at e5453e5

• Updated the FSharp.Compiler.Service dependency to version 43.7.300 to match the latest F# compiler release (link)
• Removed the unnecessary FSharp.Core dependency to avoid potential conflicts (link)
• Added a cross-platform ChangeExtensionShim method to the FileSystem type to wrap the Path.ChangeExtension function (link)
  • SynExpr.DiscardAfterMissingQualificationAfterDot, which added a new argument for the missing identifier (link, link)
  • SynExpr.AnonRecd, which added a new argument for the trivia associated with the anonymous record expression (link)
  • SynMemberDefn.ImplicitCtor, which added a new argument for the trivia associated with the implicit constructor definition (link)
• Fixed the line number for the Position field of the completionParams value in the CompletionTests.fs file to match the test case (link)

[baronfel]

Thanks for finding the appropriate spot :)