[Docs] Sync release notes.

docs/ReleaseNotes.txt

@@ -6,6 +6,37 @@ Release Notes
 =============
 
 
+--------------
+Version 4.12.3
+--------------
+
++ **Major bug fixes**
+  * **[RPM]** xrootd-voms pkg obsoletes xrootd-voms-plugin.
+  * **[Python]** Make sure XrdVersion.hh is generated correctly during pip install.
+
+--------------
+Version 4.12.2
+--------------
+
++ **Major bug fixes**
+  * **[XrdHttp]** Added protection against a NULL bridge instance.
+  * **[XrdHttp]** Avoid the reqstate to go below zero in case of strange headers.
+  * **[XrdVoms]** Set the prox field to "xrdvoms" as the extractor.
+  * **[XrdVoms]** Fix various option parsing problems.
+  * **[XrdVoms]** Backport a clean patched VOMS version from R5.
+
++ **Minor bug fixes**
+  * **[Docs]** Make the xrdmapc help text and manpage match the code.
+  * **[Docs]** Fix empty xrdmapc manpage.
+  * **[CMake]** Fix XRootD config module.
+
++ **Miscellaneous**
+  * **[Server]** Allow specification of whether or not dirlist is locally handled.
+  * **[XrdVoms]** Replace git sub-module with full-fledged component of xrootd core.
+  * **[XrdVoms]** Simplify the gropts parameter.
+  * **[XrdVoms]** Rename XrdSecgsiVOMS-4.so to XrdVoms-4.so, create XrdSecgsiVOMS-4.so
+                  symlink for compability. 
+
 --------------
 Version 4.12.1
 --------------