Unwanted diffs for Xcode 16+

**Background**
Starting from Xcode 16, Xcode adds empty `inputsPaths` and `outputPaths` causing unwanted diffs when running a `pod install`.

**Why This Is a Problem**
These unnecessary entries make the project file needlessly complex and create unwanted diffs.

**Solution**
As a workaround:
```ruby
pre_install do |install|
Xcodeproj::Project::Object::PBXShellScriptBuildPhase.class_eval do
def to_hash_as(method = :to_hash)
hash_as = super
included_keys_for_serialization_when_empty.each do |key|
if hash_as[key].nil?
hash_as[key] = []
end
end
hash_as
end

def included_keys_for_serialization_when_empty
%w(inputPaths outputPaths)
end
end
end
```

The issue names no file or test; start by locating Xcodeproj::Project::Object::PBXShellScriptBuildPhase and tracing its serialization during pod install. Compare generated project files under Xcode 16+ and confirm that empty inputPaths and outputPaths no longer produce unwanted diffs.

Written by the indexing model from the issue text.