Bump to 8.3.0beta2

Not working yet:
  - solr extension (https://github.com/php/pecl-search_engine-solr)

Dockerfile

@@ -1,4 +1,4 @@
-FROM php:8.3.0alpha3-apache-bullseye
+FROM php:8.3.0beta2-apache-bullseye
 
 # So we can use it anywhere for conditional stuff. Keeping BC with old (non-buildkit, builders)
 ARG TARGETPLATFORM

README.md

@@ -6,7 +6,7 @@ A Moodle PHP environment configured for Moodle development based on [Official PH
 
 | PHP Version  | Variant | Tags             | Status | Notes |
 |--------------|---------|------------------|--------|-------|
-| PHP 8.3      | Bullseye| dev| [![Test and publish 8.3](https://github.com/moodlehq/moodle-php-apache/actions/workflows/test_buildx_and_publish.yml/badge.svg?branch=master)](https://github.com/moodlehq/moodle-php-apache/actions/workflows/test_buildx_and_publish.yml)|8.3.0alpha3, testing|
+| PHP 8.3      | Bullseye| dev| [![Test and publish 8.3](https://github.com/moodlehq/moodle-php-apache/actions/workflows/test_buildx_and_publish.yml/badge.svg?branch=master)](https://github.com/moodlehq/moodle-php-apache/actions/workflows/test_buildx_and_publish.yml)|8.3.0beta2, testing|
 | PHP 8.2      | Bullseye| 8.2, 8.2-bullseye| [![Test and publish 8.2](https://github.com/moodlehq/moodle-php-apache/actions/workflows/test_buildx_and_publish.yml/badge.svg?branch=8.2-bullseye)](https://github.com/moodlehq/moodle-php-apache/actions/workflows/test_buildx_and_publish.yml)|
 | PHP 8.1      | Bullseye| 8.1, 8.1-bullseye| [![Test and publish 8.1](https://github.com/moodlehq/moodle-php-apache/actions/workflows/test_buildx_and_publish.yml/badge.svg?branch=8.1-bullseye)](https://github.com/moodlehq/moodle-php-apache/actions/workflows/test_buildx_and_publish.yml)|
 | PHP 8.0      | Bullseye| 8.0, 8.0-bullseye| [![Test and publish 8.0](https://github.com/moodlehq/moodle-php-apache/actions/workflows/test_buildx_and_publish.yml/badge.svg?branch=8.0-bullseye)](https://github.com/moodlehq/moodle-php-apache/actions/workflows/test_buildx_and_publish.yml)|