Add new maintainers to migrate command and SwiftFixIt module (#8713)

Added @AnthonyLatsis, @bnbarham and myself as code owners for migration
and swift fix-it.

Author: xedin

CODEOWNERS

@@ -25,5 +25,8 @@
 # The following lines are used by GitHub to automatically recommend reviewers.
 
 Sources/XCBuildSupport/* @jakepetroules
+Sources/Commands/PackageCommands/Migrate.swift @AnthonyLatsis @bnbarham @xedin @jakepetroules @dschaefer2 @shawnhyam @bripeticca @plemarquand @owenv @bkhouri @cmcgee1024 @daveyc123
+Sources/SwiftFixIt/* @AnthonyLatsis @bnbarham @xedin @jakepetroules @dschaefer2 @shawnhyam @bripeticca @plemarquand @owenv @bkhouri @cmcgee1024 @daveyc123
+Tests/SwiftFixItTests/* @AnthonyLatsis @bnbarham @xedin @jakepetroules @dschaefer2 @shawnhyam @bripeticca @plemarquand @owenv @bkhouri @cmcgee1024 @daveyc123
 
 * @jakepetroules @dschaefer2 @shawnhyam @bripeticca @plemarquand @owenv @bkhouri @cmcgee1024 @daveyc123