[FIX] Replace use of deprecated methods. (Jacques Vidrine via https://twitter.com/EACCES/status/1697243619)

Author: rentzsch

Sparkle/SUBasicUpdateDriver.m

@@ -32,7 +32,7 @@ - (void)checkForUpdatesAtURL:(NSURL *)URL host:(SUHost *)aHost
 	[appcast setDelegate:self];
 	NSString *userAgent = [NSString stringWithFormat: @"%@/%@ Sparkle/%@", [aHost name], [aHost displayVersion], ([SPARKLE_BUNDLE objectForInfoDictionaryKey:@"CFBundleVersion"] ?: nil)];
 	NSData * cleanedAgent = [userAgent dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
-	userAgent = [NSString stringWithCString:[cleanedAgent bytes] length:[cleanedAgent length]];
+	userAgent = [[NSString alloc] initWithData:cleanedAgent encoding:NSASCIIStringEncoding];
 	[appcast setUserAgentString:userAgent];
 	[appcast fetchAppcastFromURL:URL];
 }

Sparkle/SUHost.m

@@ -111,7 +111,7 @@ - (NSString *)publicDSAKey
 	// More likely, we've got a reference to a Resources file by filename:
 	NSString *keyFilename = [self objectForInfoDictionaryKey:SUPublicDSAKeyFileKey];
 	if (!keyFilename) { return nil; }
-	return [NSString stringWithContentsOfFile:[bundle pathForResource:keyFilename ofType:nil]];
+	return [NSString stringWithContentsOfFile:[bundle pathForResource:keyFilename ofType:nil] encoding:NSASCIIStringEncoding error:NULL];
 }
 
 - (NSArray *)systemProfile