Userland: Replace most printf-style APIs with AK::Format APIs :^)

Author: https://github.com/linusg
Commit: f5c35fccca
Pull-request: https://github.com/SerenityOS/serenity/pull/7632
Reviewed-by: https://github.com/awesomekling

Userland/Utilities/env.cpp

@@ -57,7 +57,7 @@ int main(int argc, char** argv)
 
     if (new_argv.size() == 0) {
         for (auto entry = environ; *entry != nullptr; ++entry)
-            printf("%s\n", *entry);
+            outln("{}", *entry);
 
         return 0;
     }