GithubActions: disable macOS platform temporarily

It is failing with:

Microsoft (R) Build Engine version 16.11.0+0538acc04 for .NET
Copyright (C) Microsoft Corporation. All rights reserved.

/Users/runner/.dotnet/sdk/5.0.400/MSBuild.dll -maxcpucount -property:Configuration=Release -property:PackageOutputPath=/Users/runner/work/fantomless/fantomless/bin /p:Title=Fantomas /p:PackageVersion=4.5.1 /p:Authors=Florian Verdonck Jindřich Ivánek /p:Owners=Anh-Dung Phan /p:PackageRequireLicenseAcceptance=false /p:Description=This library aims at formatting F# source files based on a given configuration.
Fantomas will ensure correct indentation and consistent spacing between elements in the source files.
Some common use cases include
(1) Reformatting a code base to conform a universal page width
(2) Converting legacy code from verbose syntax to light syntax
(3) Formatting auto-generated F# signatures. /p:Summary=Source code formatter for F# /p:PackageReleaseNotes=Fix StackOverflow exceptions when collecting ColMultilineItem list. [fsprojects#1839](fsprojects#1839)
Honor .fantomasignore file when processing a folder. [fsprojects#1834](fsprojects#1834)
Fix Overly indented members on a record type with accessibility modifier. [fsprojects#1824](fsprojects#1824)
Fix MultiLineLambdaClosingNewline not respected with function keyword. [fsprojects#1823](fsprojects#1823)
Fix Comment is lost at the end of a match. [fsprojects#1822](fsprojects#1822) /p:Copyright=Copyright © 2021 /p:PackageTags=F# fsharp formatting beautifier indentation indenter /p:PackageProjectUrl=https://github.com/fsprojects/fantomas -target:pack -verbosity:m /bl:/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/tmpF67x0C.tmp.binlog /clp:ForceConsoleColor src/Fantomas/Fantomas.fsproj
  Fantomas -> /Users/runner/work/fantomless/fantomless/src/Fantomas/bin/Release/netstandard2.0/Fantomas.dll
  Paket version 6.0.0-rc006
  Total time taken: 0 milliseconds
/Users/runner/work/fantomless/fantomless/.paket/Paket.Restore.targets(370,15): error MSB4030: " " is an invalid value for the "NoDefaultExcludes" parameter of the "PackTask" task. The "NoDefaultExcludes" parameter is of type "System.Boolean". [/Users/runner/work/fantomless/fantomless/src/Fantomas/Fantomas.fsproj]
: /Users/runner/work/fantomless/fantomless/.paket/Paket.Restore.targets(370,15): error MSB4030: " " is an invalid value for the "NoDefaultExcludes" parameter of the "PackTask" task. The "NoDefaultExcludes" parameter is of type "System.Boolean".
Finished (Failed) 'DotNet:pack' in 00:00:17.2484182
Finished (Failed) 'Pack' in 00:00:17.2537065

---------------------------------------------------------------------
Build Time Report
---------------------------------------------------------------------
Target           Duration
------           --------
Clean            00:00:00.0054029
ProjectVersion   00:00:00.0095845
CheckFormat      00:00:28.1530106
Build            00:00:50.1780681
UnitTests        00:00:52.8291326
Benchmark        00:01:18.1282908
Pack             00:00:17.2535228   (Exception of type 'Fake.DotNet.MSBuildException' was thrown.)
All              00:00:00           (skipped)
Total:           00:03:46.6883141
Status:          Failure
---------------------------------------------------------------------
Script reported an error:
-> BuildFailedException: Target 'Pack' failed.
-> One or more errors occurred. (Exception of type 'Fake.DotNet.MSBuildException' was thrown.)
-> MSBuildException: Exception of type 'Fake.DotNet.MSBuildException' was thrown.
Hint: To further diagnose the problem you can run fake in verbose mode `fake -v run ...` or set the 'FAKE_DETAILED_ERRORS' environment variable to 'true'
Hint: Could not find a version in your paket.dependencies file, consider adding 'version 5.257.0' at the top of your dependencies file (/Users/runner/work/fantomless/fantomless/paket.dependencies).
Read fsprojects/FAKE#2193 for details.

.github/workflows/main.yml

@@ -11,7 +11,7 @@ jobs:
 
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest, macOS-latest]
+        os: [ubuntu-latest, windows-latest]
         dotnet: [5.0.300]
     runs-on: ${{ matrix.os }}