Support throwing dependency trait (#320)

For example:

```swift
@test(.dependency(\.defaultDatabase, try .create())
```

Author: stephencelis

Sources/Dependencies/Traits/TestTrait.swift

@@ -1,7 +1,7 @@
 public struct _DependenciesTrait: Sendable {
-  package let updateValues: @Sendable (inout DependencyValues) -> Void
+  package let updateValues: @Sendable (inout DependencyValues) throws -> Void
 
-  package init(_ updateValues: @escaping @Sendable (inout DependencyValues) -> Void) {
+  package init(_ updateValues: @escaping @Sendable (inout DependencyValues) throws -> Void) {
     self.updateValues = updateValues
   }
 

Sources/DependenciesTestSupport/TestTrait.swift

@@ -43,10 +43,10 @@
     ///   - value: A dependency value to override for the test.
     public static func dependency<Value>(
       _ keyPath: WritableKeyPath<DependencyValues, Value> & Sendable,
-      _ value: @autoclosure @escaping @Sendable () -> Value
+      _ value: @autoclosure @escaping @Sendable () throws -> Value
     ) -> Self {
       Self {
-        $0[keyPath: keyPath] = value()
+        $0[keyPath: keyPath] = try value()
       }
     }
 
@@ -79,9 +79,9 @@
     ///   - keyPath: A key path to a dependency value.
     ///   - value: A dependency value to override for the test.
     public static func dependency<Value: TestDependencyKey>(
-      _ value: @autoclosure @escaping @Sendable () -> Value
+      _ value: @autoclosure @escaping @Sendable () throws -> Value
     ) -> Self where Value == Value.Value {
-      Self { $0[Value.self] = value() }
+      Self { $0[Value.self] = try value() }
     }
 
     /// A trait that overrides a test's or suite's dependencies.
@@ -96,8 +96,8 @@
     public var isRecursive: Bool { true }
 
     public func prepare(for test: Test) async throws {
-      testValuesByTestID.withValue {
-        self.updateValues(&$0[test.id, default: DependencyValues(context: .test)])
+      try testValuesByTestID.withValue {
+        try self.updateValues(&$0[test.id, default: DependencyValues(context: .test)])
       }
     }
   }