Bumps .NET version to .NET9; Adds PS7.5 workflow; Bumps InvokeBuild to v5.12.0; Bumps MkDocs to v1.6.1; Bumps MkDocs Material Theme to v9.5.44

Bumps .NET version to .NET9; Adds PS7.5 workflow; Bumps InvokeBuild to v5.12.0; Bumps MkDocs to v1.6.1; Bumps MkDocs Material Theme to v9.5.44 #2182