Update to Cake 5.0 and .NET 9

[pascalberger]

Updates to support Cake 5.0:

• Builds against Cake 5.0
• Multi-Targets additionally .NET 9 and removes support for .NET 6 & .NET 7
• Updates build to Cake 5.0

Fixes #193
Fixes #194

[pascalberger]

Tests are currently failing. Actual exception is:

System.TypeInitializationException: The type initializer for 'LibGit2Sharp.Core.NativeMethods' threw an exception.
 ---> System.DllNotFoundException: Unable to load DLL 'git2-a418d9d' or one of its dependencies: The specified module could not be found. (0x8007007E)
   at LibGit2Sharp.Core.NativeMethods.git_libgit2_init()
   at LibGit2Sharp.Core.NativeMethods.InitializeNativeLibrary() in /_/LibGit2Sharp/Core/NativeMethods.cs:line 148
   at LibGit2Sharp.Core.NativeMethods.InitializeNativeLibrary() in /_/LibGit2Sharp/Core/NativeMethods.cs:line 144
   at LibGit2Sharp.Core.NativeMethods..cctor() in /_/LibGit2Sharp/Core/NativeMethods.cs:line 54
   --- End of inner exception stack trace ---
   at LibGit2Sharp.Core.NativeMethods.git_repository_init_ext(git_repository*& repository, FilePath path, GitRepositoryInitOptions options)
   at LibGit2Sharp.Core.Proxy.git_repository_init_ext(FilePath workdirPath, FilePath gitdirPath, Boolean isBare) in /_/LibGit2Sharp/Core/Proxy.cs:line 2492
   at LibGit2Sharp.Repository.Init(String path, Boolean isBare) in /_/LibGit2Sharp/Repository.cs:line 498
   at LibGit2Sharp.Repository.Init(String path) in /_/LibGit2Sharp/Repository.cs:line 485
   at Cake.Git.GitAliases.GitInit(ICakeContext context, DirectoryPath initDirectoryPath)
   at Submission#0.GitInit(DirectoryPath initDirectoryPath)
   at Submission#0.<<Initialize>>b__0_3()

[pascalberger]

Tests are currently failing. Actual exception is:

System.TypeInitializationException: The type initializer for 'LibGit2Sharp.Core.NativeMethods' threw an exception.
 ---> System.DllNotFoundException: Unable to load DLL 'git2-a418d9d' or one of its dependencies: The specified module could not be found. (0x8007007E)
   at LibGit2Sharp.Core.NativeMethods.git_libgit2_init()
   at LibGit2Sharp.Core.NativeMethods.InitializeNativeLibrary() in /_/LibGit2Sharp/Core/NativeMethods.cs:line 148
   at LibGit2Sharp.Core.NativeMethods.InitializeNativeLibrary() in /_/LibGit2Sharp/Core/NativeMethods.cs:line 144
   at LibGit2Sharp.Core.NativeMethods..cctor() in /_/LibGit2Sharp/Core/NativeMethods.cs:line 54
   --- End of inner exception stack trace ---
   at LibGit2Sharp.Core.NativeMethods.git_repository_init_ext(git_repository*& repository, FilePath path, GitRepositoryInitOptions options)
   at LibGit2Sharp.Core.Proxy.git_repository_init_ext(FilePath workdirPath, FilePath gitdirPath, Boolean isBare) in /_/LibGit2Sharp/Core/Proxy.cs:line 2492
   at LibGit2Sharp.Repository.Init(String path, Boolean isBare) in /_/LibGit2Sharp/Repository.cs:line 498
   at LibGit2Sharp.Repository.Init(String path) in /_/LibGit2Sharp/Repository.cs:line 485
   at Cake.Git.GitAliases.GitInit(ICakeContext context, DirectoryPath initDirectoryPath)
   at Submission#0.GitInit(DirectoryPath initDirectoryPath)
   at Submission#0.<<Initialize>>b__0_3()

Runtime files were not packaged correctly. Should be fine now

[devlead]

LGMT 👍