gh-95555: Change the re MAGIC number to 20260622

Use the date the new opcodes were finalized rather than a future-dated
placeholder.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: serhiy-storchaka

Lib/re/_constants.py

@@ -13,7 +13,7 @@
 
 # update when constants are added or removed
 
-MAGIC = 20260628
+MAGIC = 20260622
 
 from _sre import MAXREPEAT, MAXGROUPS  # noqa: F401
 

Modules/_sre/sre_constants.h

@@ -11,7 +11,7 @@
  * See the sre.c file for information on usage and redistribution.
  */
 
-#define SRE_MAGIC 20260628
+#define SRE_MAGIC 20260622
 #define SRE_OP_FAILURE 0
 #define SRE_OP_SUCCESS 1
 #define SRE_OP_ANY 2