Fix Linux

[yonaskolb]

Short description 📝

Builds have recently started to fail on Linux. I'm not exactly sure why, must be the newer versions of Swift on CI.
You can see this on master where I re-ran the build https://github.com/tuist/XcodeProj/runs/2593437535

/home/runner/work/XcodeProj/XcodeProj/Sources/XcodeProj/Scheme/XCScheme+SerialAction.swift:42:10: error: Objective-C interoperability is disabled
        @objc dynamic func isEqual(to: Any?) -> Bool {

Solution 📦

This removes the @objc dynamic from Serial action to remove references to ObjC

[codecov-commenter]

Codecov Report

Merging #615 (574889f) into main (be702b9) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #615   +/-   ##
=======================================
  Coverage   84.14%   84.14%           
=======================================
  Files         154      154           
  Lines        8706     8706           
=======================================
  Hits         7326     7326           
  Misses       1380     1380           

Impacted Files	Coverage Δ
...urces/XcodeProj/Scheme/XCScheme+SerialAction.swift	100.00% <100.00%> (ø)

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