Readme: point the Relay table row at php-82

Relay is built for PHP 8.2-8.5, so relay-php-81 doesn't exist. Use the
lowest built version (matching e.g. the Oracle oci8-php-83 row).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: tillkruss

Readme.md

@@ -88,7 +88,7 @@ functions:
 | RdKafka          | `${bref-extra:rdkafka-php-81}`         |
 | Redis (phpredis) | `${bref-extra:redis-php-81}`           |
 | Redis-Igbinary   | `${bref-extra:redis-igbinary-php-81}`  |
-| Relay            | `${bref-extra:relay-php-81}`           |
+| Relay            | `${bref-extra:relay-php-82}`           |
 | Scout APM        | `${bref-extra:scoutapm-php-81}`        |
 | Scrypt           | `${bref-extra:scrypt-php-81}`          |
 | SNMP             | `${bref-extra:snmp-php-81}`            |