Enable SwiftLint rule 'strict_fileprivate' and fix all violations

.swiftlint.yml

@@ -155,7 +155,7 @@ whitelist_rules:
 #  - sorted_imports # Managed by SwiftFormat.
   - statement_position
 #  - static_operator
-#  - strict_fileprivate
+  - strict_fileprivate
   - strong_iboutlet
   - superfluous_disable_command
   - switch_case_alignment

passKitTests/Testbase/TestPGPKeys.swift

@@ -11,14 +11,14 @@ import XCTest
 @testable import passKit
 
 struct PGPTestSet {
-    fileprivate static var ALL_TEST_SETS: [String: PGPTestSet] = [:]
+    fileprivate static var ALL_TEST_SETS: [String: PGPTestSet] = [:] // swiftlint:disable:this strict_fileprivate
 
     let publicKey: String
     let privateKey: String
     let fingerprint: String
     let passphrase: String
 
-    fileprivate func collect() -> Self {
+    fileprivate func collect() -> Self { // swiftlint:disable:this strict_fileprivate
         Self.ALL_TEST_SETS[fingerprint] = self
         return self
     }