MDL-65292 style: Fix all function declarations white space

This has been generated running the following Sniffs, all
them part of the Moodle's CodeSniffer standard:
- PSR12.Functions.ReturnTypeDeclaration
- PSR12.Functions.NullableTypeDeclaration
- moodle.Methods.MethodDeclarationSpacing
- Squiz.Whitespace.ScopeKeywordSpacing

All them are, exclusively, about correct spacing, so the changes
are, all them, only white space changes.

Only exceptions to the above are 3 changes what were setting the
return type in a new line, and, when that happens, the closing
parenthesis (bracket) has to go to the same line than the colon.

cache/classes/output/renderer.php

@@ -377,7 +377,7 @@ class renderer extends \plugin_renderer_base {
      *
      * @return string
      */
-    public function additional_lock_actions() : string {
+    public function additional_lock_actions(): string {
         $url = new moodle_url('/cache/admin.php', array('action' => 'newlockinstance'));
         $select = new single_select($url, 'lock', cache_factory::get_administration_display_helper()->get_addable_lock_options());
         $select->label = get_string('addnewlockinstance', 'cache');