Added NEWS and UPGRADING entries

Author: marc-mabe

NEWS

@@ -18,6 +18,7 @@ Curl:
 
 Date:
   . Added DateTime[Immutable]::createFromTimestamp. (Marc Bennewitz)
+  . Added DateTime[Immutable]::[get|set]Microseconds. (Marc Bennewitz)
 
 DOM:
   . Added DOMNode::compareDocumentPosition(). (nielsdos)

UPGRADING

@@ -146,6 +146,9 @@ PHP 8.4 UPGRADE NOTES
 - Date:
   . Added static methods
     DateTime[Immutable]::createFromTimestamp(int|float $timestamp): static.
+  . Added method DateTime[Immutable]::getMicroseconds(): int.
+  . Added method
+    DateTime[Immutable]::setMicroseconds(int $microseconds): static.
 
 - DOM:
   . Added constant DOMNode::DOCUMENT_POSITION_DISCONNECTED.