🩹 Fix build issues on tvOS and watchOS

Author: ftchirou

PredicateKit/Predicate.swift

@@ -378,7 +378,7 @@ public func == <E: Expression, T: Equatable & Primitive> (lhs: E, rhs: T) -> Pre
   .comparison(.init(lhs, .equal, rhs))
 }
 
-@available(iOS 13.0, *)
+@available(iOS 13.0, watchOS 6.0, tvOS 13.0, *)
 public func == <E: Expression, T: Identifiable> (lhs: E, rhs: T) -> Predicate<E.Root> where E.Value == T, T.ID: Primitive {
   .comparison(.init(ObjectIdentifier<E, T.ID>(root: lhs), .equal, rhs.id))
 }

PredicateKitTests/CoreDataTests/NSFetchRequestBuilderTests.swift

@@ -87,7 +87,7 @@ final class NSFetchRequestBuilderTests: XCTestCase {
     XCTAssertEqual(comparison.comparisonPredicateModifier, .direct)
   }
 
-  @available(iOS 13.0, *)
+  @available(iOS 13.0, watchOS 6.0, tvOS 13.0, *)
   func testEqualityWithIdentifiable() throws {
     guard let identifiable = makeIdentifiable() else {
       XCTFail("could not initialize IdentifiableData")

PredicateKitTests/CoreDataTests/NSManagedObjectContextExtensionsTests.swift

@@ -116,7 +116,7 @@ final class NSManagedObjectContextExtensionsTests: XCTestCase {
     XCTAssertNil(texts.first?["creationDate"])
   }
 
-  @available(iOS 13.0, *)
+  @available(iOS 13.0, watchOS 6.0, tvOS 13.0, *)
   func testFetchWithObjectComparison() throws {
     let attachment1 = try container.viewContext.insertAttachment("1")
     let attachment2 = try container.viewContext.insertAttachment("2")

PredicateKitTests/OperatorTests.swift

@@ -236,7 +236,7 @@ final class OperatorTests: XCTestCase {
     XCTAssertEqual(value, 42)
   }
 
-  @available(iOS 13.0, *)
+  @available(iOS 13.0, watchOS 6.0, tvOS 13.0, *)
   func testKeyPathEqualIdentifiable() throws {
     struct Data {
       let identifiable: IdentifiableData