Enable back php-solr now that 2.7.0 supports php83

Solr 2.7.0 has come with support for PHP 8.3:

https://github.com/php/pecl-search_engine-solr/releases/tag/2.7.0

So, enabling it back.

Author: stronk7

root/tmp/setup/php-extensions.sh

@@ -58,9 +58,8 @@ docker-php-ext-configure ldap
 docker-php-ext-install -j$(nproc) ldap
 
 # APCu, igbinary, Memcached, PCov, Redis, Solr, timezonedb, uuid
-# Note: Missing as of 2023-06-17: solr
-pecl install apcu igbinary memcached pcov timezonedb uuid
-docker-php-ext-enable apcu igbinary memcached pcov timezonedb uuid
+pecl install apcu igbinary memcached pcov solr timezonedb uuid
+docker-php-ext-enable apcu igbinary memcached pcov solr timezonedb uuid
 
 echo 'apc.enable_cli = On' >> /usr/local/etc/php/conf.d/10-docker-php-ext-apcu.ini
 

tests/fixtures/test.php

@@ -14,7 +14,7 @@
     'redis',
     'soap',
     'sodium',
-    //'solr',  -- Missing as of 2023-06-17.
+    'solr',
     'sqlsrv',
     'uuid',
     'xsl',