[YANG] update sonic DB version string format

Old format: version_a_b_c
New format: version_<branch>_<nn>

sonic-utilities:
* 20d1495 2023-12-21 | [db_migrator] add db migrator version space for 202305/202311 branch (sonic-net#3081) (HEAD -> master, github/master) [Ying Xie]
* a68d3d3 2023-12-20 | Collect module EEPROM data in dump (sonic-net#3009) [Junchao-Mellanox]
* e7a8def 2023-12-19 | Enhanced route_check.py for multi_asic platforms (sonic-net#3077) [Deepak Singhal]

Signed-off-by: Ying Xie <[email protected]>

Author: yxieca

src/sonic-utilities

@@ -23,7 +23,7 @@ module sonic-versions {
                 leaf VERSION {
                     type string {
                         length 1..255;
-                        pattern 'version_([1-9]|[1-9]{1}[0-9]{1})_([0-9]{1,2})_([0-9]{1,2})';
+                        pattern 'version_(([1-9]|[1-9]{1}[0-9]{1})_([0-9]{1,2})_([0-9]{1,2})|([1-9]{1}[0-9]{5})_([0-9]{2}))';
                     }
                 }
             }