Update swift format (#691)

Package.swift

@@ -11,7 +11,7 @@ let package = Package(
         .package(url: "https://github.com/apple/swift-nio", from: "2.34.0"),
         .package(url: "https://github.com/apple/swift-nio-ssl", from: "2.16.0"),
         .package(url: "https://github.com/apple/swift-log", from: "1.4.0"),
-        .package(url: "https://github.com/nicklockwood/SwiftFormat", .exact("0.48.3")),
+        .package(url: "https://github.com/nicklockwood/SwiftFormat", .exact("0.49.4")),
         .package(url: "https://github.com/apple/swift-standard-library-preview.git", .exact("0.0.3")),
         .package(url: "https://github.com/apple/swift-collections.git", .upToNextMajor(from: "1.0.0")),
     ],

Sources/NIOIMAPCore/ModifiedUTF7.swift

@@ -78,7 +78,7 @@ public enum ModifiedUTF7 {
     /// - throws: An `OddByteCountError` if `buffer` contains an off number of bytes.
     /// - returns: A `String` that can be used to e.g. display to a user.
     static func decode(_ buffer: ByteBuffer) throws -> String {
-        var string: String = ""
+        var string = ""
         string.reserveCapacity(buffer.readableBytes)
 
         var buffer = buffer

Tests/CLILibTests/CommandRoundtripHandler+PromiseTests.swift

@@ -24,7 +24,7 @@ class CommandRoundtripHandler_PromiseTests: XCTestCase {
 
     override func setUp() {
         let logger = Logger(label: "test")
-        channel = EmbeddedChannel(handler: CommandRoundtripHandler(logger: logger))
+        self.channel = EmbeddedChannel(handler: CommandRoundtripHandler(logger: logger))
     }
 
     override func tearDown() {

Tests/NIOIMAPCoreTests/Grammar/CoreTypealiasesTests.swift

@@ -22,7 +22,7 @@ class CoreTypealiasesTests: EncodeTestClass {}
 
 extension CoreTypealiasesTests {
     func testNil() {
-        let expected: String = "NIL"
+        let expected = "NIL"
         let input: String? = nil
         let size = self.testBuffer.writeNString(input)
         XCTAssertEqual(size, expected.utf8.count)