Merge branch '7.4' into 8.0

* 7.4:
  [Validator][Serializer] Make internal properties private
  [VarExporter] Fix serializing classes with __serialize() returning unprefixed private properties
  Remove direct access to internal properties cross-components
  remove deprecated nullable option from primary key columns
  [Validator] Optimize serialized metadata and cleanup tests
  specific fix to avoid 'outag' when inflecting 'outages'
  Use <info> for options in command description
  [ObjectMapper] Remove obsolete TODO
  [HttpFoundation][HttpKernel][WebProfilerBundle] Add support for the `QUERY` HTTP method
  [DependencyInjection] Don’t autowire excluded services
  Add bool return type to CustomCredentials callable parameter
  [Process] Enhance hasSystemCallBeenInterrupted function for non-english locale
  [FrameworkBundle] Make `cache:warmup` warm up read-only caches

Author: nicolas-grekas

Command/ServerDumpCommand.php

@@ -63,7 +63,7 @@ protected function configure(): void
 
                   <info>php %command.full_name%</info>
 
-                You can consult dumped data in HTML format in your browser by providing the <comment>--format=html</comment> option
+                You can consult dumped data in HTML format in your browser by providing the <info>--format=html</info> option
                 and redirecting the output to a file:
 
                   <info>php %command.full_name% --format="html" > dump.html</info>