Add php8.2 and drop secp256k1 library which is only supported in php7

etc/systemd/system/php8.2-fpm.service

@@ -0,0 +1,16 @@
+# This service is actually a systemd target,
+# but we are using a service since targets cannot be reloaded.
+
+[Unit]
+Description=The PHP 8.2 FastCGI Process Manager (multi instance master)
+Documentation=man:php-fpm8.2(8)
+After=network.target
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=/bin/true
+ExecReload=/bin/true
+
+[Install]
+WantedBy=multi-user.target