Fix availability annotations

Author: andrewheard

FirebaseVertexAI/Tests/Unit/Snippets/ChatSnippets.swift

@@ -16,7 +16,7 @@ import FirebaseCore
 import FirebaseVertexAI
 import XCTest
 
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
 final class ChatSnippets: XCTestCase {
   override func setUpWithError() throws {
     try FirebaseApp.configureForSnippets()

FirebaseVertexAI/Tests/Unit/Snippets/ControlledGeneration.swift

@@ -16,7 +16,7 @@ import FirebaseCore
 import FirebaseVertexAI
 import XCTest
 
-@available(iOS 15.0, macCatalyst 15.0, *)
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
 final class ControlledGenerationSnippets: XCTestCase {
   override func setUpWithError() throws {
     try FirebaseApp.configureForSnippets()

FirebaseVertexAI/Tests/Unit/Snippets/CountTokens.swift

@@ -16,7 +16,7 @@ import FirebaseCore
 import FirebaseVertexAI
 import XCTest
 
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
 final class CountTokensSnippets: XCTestCase {
   override func setUpWithError() throws {
     try FirebaseApp.configureForSnippets()

FirebaseVertexAI/Tests/Unit/Snippets/FunctionCalling.swift

@@ -16,7 +16,7 @@ import FirebaseCore
 import FirebaseVertexAI
 import XCTest
 
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
 final class FunctionCallingSnippets: XCTestCase {
   override func setUpWithError() throws {
     try FirebaseApp.configureForSnippets()

FirebaseVertexAI/Tests/Unit/Snippets/GenerationConfig.swift

@@ -16,7 +16,7 @@ import FirebaseCore
 import FirebaseVertexAI
 import XCTest
 
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
 final class GenerationConfigSnippets: XCTestCase {
   override func setUpWithError() throws {
     try FirebaseApp.configureForSnippets()

FirebaseVertexAI/Tests/Unit/Snippets/SafetySettings.swift

@@ -16,7 +16,7 @@ import FirebaseCore
 import FirebaseVertexAI
 import XCTest
 
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
 final class SafetySettingsSnippets: XCTestCase {
   override func setUpWithError() throws {
     try FirebaseApp.configureForSnippets()

FirebaseVertexAI/Tests/Unit/Snippets/SystemInstructions.swift

@@ -16,7 +16,7 @@ import FirebaseCore
 import FirebaseVertexAI
 import XCTest
 
-@available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
 final class SystemInstructionsSnippets: XCTestCase {
   override func setUpWithError() throws {
     try FirebaseApp.configureForSnippets()

FirebaseVertexAI/Tests/Unit/Snippets/TextGeneration.swift

@@ -16,7 +16,7 @@ import FirebaseCore
 import FirebaseVertexAI
 import XCTest
 
-@available(iOS 15.0, macCatalyst 15.0, *)
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
 final class TextGeneration: XCTestCase {
   override func setUpWithError() throws {
     try FirebaseApp.configureForSnippets()