fix release date

Author: wkliao

Release_notes/1.12.3.md

@@ -1,4 +1,4 @@
-[PnetCDF](https://parallel-netcdf.github.io) Version 1.12.3 Release Notes (January 21, 2021)
+[PnetCDF](https://parallel-netcdf.github.io) Version 1.12.3 Release Notes (February 21, 2021)
 ------------------------------------------------------------------------------
 
 * New optimization

index.html

@@ -21,7 +21,7 @@ <h1>PnetCDF: A Parallel I/O Library for NetCDF File Access</h1>
 
 <h2 id="News">News</h2>
 <ul>
-<li><strong>January 21, 2022</strong>: Release of 1.12.3 is available.</li>
+<li><strong>February 21, 2022</strong>: Release of 1.12.3 is available.</li>
 <li><strong>November 2, 2018</strong>: The official PnetCDF project web pages
 have migrated to github.com from its previous location at <a
 href=https://trac.mcs.anl.gov/projects/parallel-netcdf>

wiki/Download.html

@@ -48,7 +48,7 @@
    <th>SHA-1 Checksum</th>
  </tr>
  <tr>
-   <td align=center>January 21, 2022</td>
+   <td align=center>February 21, 2022</td>
    <td align=center><a href=https://github.com/Parallel-NetCDF/Parallel-NetCDF.github.io/blob/master/Release_notes/1.12.3.md>1.12.3</a></td>
    <td><a href="../Release/pnetcdf-1.12.3.tar.gz" onClick="var that=this; ga('send', 'event', 'PnetCDF', 'Source Download (GZ)', 'pnetcdf-1.12.3.tar.gz', 1); ga('pnetcdfTracker.send', 'event', 'PnetCDF', 'Source Download (GZ)', 'pnetcdf-1.12.3.tar.gz', 1); ga('parallelnetcdfTracker.send', 'event', 'PnetCDF', 'Source Download (GZ)', 'pnetcdf-1.12.3.tar.gz', 1); setTimeout(function(){location.href=that.href;},500); return false;">pnetcdf-1.12.3.tar.gz</a></td>
    <td>2.3 MB</td>