libmysqlclient: init 3.2 and default to it

https://mariadb.com/kb/en/changes-and-improvements-in-mariadb-connector-c-32/

nixos/doc/manual/from_md/release-notes/rl-2111.section.xml

@@ -888,6 +888,17 @@
           release notes</link> for changes and upgrade instructions.
         </para>
       </listitem>
+      <listitem>
+        <para>
+          The MariaDB C client library, also known as libmysqlclient or
+          mariadb-connector-c, was upgraded from 3.1.x to 3.2.x. While
+          this should hopefully not have any impact, this upgrade comes
+          with some changes to default behavior, so you might want to
+          review the
+          <link xlink:href="https://mariadb.com/kb/en/changes-and-improvements-in-mariadb-connector-c-32/">upstream
+          release notes</link>.
+        </para>
+      </listitem>
     </itemizedlist>
   </section>
 </section>

nixos/doc/manual/release-notes/rl-2111.section.md

@@ -228,3 +228,5 @@ To be able to access the web UI this port needs to be opened in the firewall.
 - Nginx will use the value of `sslTrustedCertificate` if provided for a virtual host, even if `enableACME` is set. This is useful for providers not using the same certificate to sign OCSP responses and server certificates.
 
 - MariaDB was upgraded from 10.5.x to 10.6.x. Please read the [upstream release notes](https://mariadb.com/kb/en/changes-improvements-in-mariadb-106/) for changes and upgrade instructions.
+
+- The MariaDB C client library, also known as libmysqlclient or mariadb-connector-c, was upgraded from 3.1.x to 3.2.x. While this should hopefully not have any impact, this upgrade comes with some changes to default behavior, so you might want to review the [upstream release notes](https://mariadb.com/kb/en/changes-and-improvements-in-mariadb-connector-c-32/).

pkgs/servers/sql/mariadb/connector-c/3_2.nix

@@ -0,0 +1,6 @@
+{ callPackage, ... } @ args:
+
+callPackage ./. (args // {
+  version = "3.2.3";
+  sha256 = "1x1i4ck4c3sgkw083v02zk3rbkm5h0x1vl4m58j95q1qcijkiamn";
+})

pkgs/top-level/all-packages.nix

@@ -20124,10 +20124,12 @@ with pkgs;
 
   rpcsvc-proto = callPackage ../tools/misc/rpcsvc-proto { };
 
-  libmysqlclient = libmysqlclient_3_1;
+  libmysqlclient = libmysqlclient_3_2;
   libmysqlclient_3_1 = mariadb-connector-c_3_1;
-  mariadb-connector-c = mariadb-connector-c_3_1;
+  libmysqlclient_3_2 = mariadb-connector-c_3_2;
+  mariadb-connector-c = mariadb-connector-c_3_2;
   mariadb-connector-c_3_1 = callPackage ../servers/sql/mariadb/connector-c/3_1.nix { };
+  mariadb-connector-c_3_2 = callPackage ../servers/sql/mariadb/connector-c/3_2.nix { };
 
   mariadb-galera = callPackage ../servers/sql/mariadb/galera {
     asio = asio_1_10;