Update SwiftLint to v0.55.1

[rebello95]

Updates our version of SwiftLint, but opts out of one of the new rules because making the required changes:

--- a/Libraries/Connect/Internal/Interceptors/GRPCWebInterceptor.swift
+++ b/Libraries/Connect/Internal/Interceptors/GRPCWebInterceptor.swift
@@ -260,17 +260,11 @@ extension GRPCWebInterceptor: StreamInterceptor {
     }
 }
 
-private struct TrailersDecodingError: Error {}
-
 private extension Trailers {
     static func fromGRPCHeadersBlock(_ source: Data) throws -> Self {
-        guard let string = String(data: source, encoding: .utf8) else {
-            throw TrailersDecodingError()
-        }
-
         // Decode trailers based on gRPC Web spec:
         // https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-WEB.md
-        return string
+        return String(decoding: source, as: UTF8.self)
             .split(separator: "\r\n")
             .reduce(into: Trailers()) { trailers, line in
                 guard let separatorIndex = line.firstIndex(of: ":") else {

Caused some tests to fail:

FAILED: gRPC-Web Unexpected Responses/HTTPVersion:1/TLS:false/trailers-in-body/unary/multiple-responses:
	actual error {code: 2 (unknown), message: "RPC response missing status"} does not match expected code 12 (unimplemented)

It looks like there was some discussion around this rule being potentially problematic here: realm/SwiftLint#5263 (comment)

[eseay]

Good call on disabling that rule. In some of my other repos, I've gone through the process of migrating to the new format without having the context outlined in that issue commentary, and I now regret that decision.

[rebello95]

Thanks for the review @eseay! Honestly I noticed because of the failing test and then looked into it more. Surprising that there's an actual behavior change between the existing function and the suggested replacement...