Build failure on Xcode 13 + Mint

[shuguenot]

PathKit + Spectre should be upgraded to allow compilation on Xcode 13

https://github.com/kylef/PathKit/releases/tag/1.0.1
https://github.com/kylef/Spectre/releases/tag/0.10.1

🌱 Cloning FengNiao fc447de
🌱 Resolving package
🌱 Building package
remark: Incremental compilation has been disabled: it is not compatible with whole module optimizationremark: Incremental compilation has been disabled: it is not compatible with whole module optimizationremark: Incremental compilation has been disabled: it is not compatible with whole module optimization[1/4] Compiling PathKit PathKit.swift
/private/var/folders/7n/psqvtrtd46l4h9m92tb85mrc0000gp/T/mint/github.com_FengNiao/.build/checkouts/PathKit/Sources/PathKit.swift:98:14: warning: 'Hashable.hashValue' is deprecated as a protocol requirement; conform type 'Path' to 'Hashable' by implementing 'hash(into:)' instead
  public var hashValue: Int {
             ^
/private/var/folders/7n/psqvtrtd46l4h9m92tb85mrc0000gp/T/mint/github.com_FengNiao/.build/checkouts/PathKit/Sources/PathKit.swift:591:12: error: value of optional type 'UnsafeMutablePointer<CChar>?' (aka 'Optional<UnsafeMutablePointer<Int8>>') must be unwrapped to a value of type 'UnsafeMutablePointer<CChar>' (aka 'UnsafeMutablePointer<Int8>')
      free(cPattern)
           ^
/private/var/folders/7n/psqvtrtd46l4h9m92tb85mrc0000gp/T/mint/github.com_FengNiao/.build/checkouts/PathKit/Sources/PathKit.swift:591:12: note: coalesce using '??' to provide a default when the optional value contains 'nil'
      free(cPattern)
           ^
                    ?? <#default value#>
/private/var/folders/7n/psqvtrtd46l4h9m92tb85mrc0000gp/T/mint/github.com_FengNiao/.build/checkouts/PathKit/Sources/PathKit.swift:591:12: note: force-unwrap using '!' to abort execution if the optional value contains 'nil'
      free(cPattern)
           ^
                   !
'FengNiao' /private/var/folders/7n/psqvtrtd46l4h9m92tb85mrc0000gp/T/mint/github.com_FengNiao: warning: Invalid Exclude '/private/var/folders/7n/psqvtrtd46l4h9m92tb85mrc0000gp/T/mint/github.com_FengNiao/Tests/FengNiaoKitTests/Tests/Fixtures': File not found.
🌱 Encountered error during "swift build -c release -Xswiftc -target -Xswiftc x86_64-apple-macosx11.6". Use --verbose to see full output
🌱  Failed to build FengNiao fc447de with SPM