Incompatibilities with `-dev` PHP versions

[asgrim]

A couple of incompatibilities with -dev type PHP versions have been spotted; first, this test is stripping out the -dev version;

1) Php\PieUnitTest\DependencyResolver\FetchDependencyStatusesTest::testRequiresReturnsListOfStatuses
Failed asserting that two strings are identical.
--- Expected
+++ Actual
@@ @@
-'ext-core: == 8.5.5.0 ✅'
+'ext-core: == 8.5.5.0 🚫 (your version is 8.5.5.0-dev)'

Secondly, when we want to install bundled extensions, the -dev is stripped and we try to download a stable instead;

$ /home/james/workspace/oss/php-src-build/bin/php bin/pie install php/dom
🥧 PHP Installer for Extensions (PIE) 1.4.9999999.9999999-dev, from The PHP Foundation
This command may need elevated privileges, and may prompt you for your password.
You are running PHP 8.6.0-dev
Target PHP installation: 8.6.0 ts, on Linux/OSX/etc x86_64 (from /home/james/workspace/oss/php-src-build/bin/php)
Found package: php/dom:8.6.0 which provides ext-dom

In CurlDownloader.php line 671:
                                                                                                                 
  The "https://codeload.github.com/php/php-src/legacy.zip/php-8.6.0" file could not be downloaded (HTTP/2 404 )  
                                                                                                                 

install [-j|--make-parallel-jobs MAKE-PARALLEL-JOBS] [--skip-enable-extension] [--force] [-d|--working-dir WORKING-DIR] [--with-php-config WITH-PHP-CONFIG] [--with-php-path WITH-PHP-PATH] [--with-phpize-path WITH-PHPIZE-PATH] [--no-cache] [--allow-non-interactive-project-install] [--auto-install-build-tools] [--no-build-tools-check] [--auto-install-system-dependencies] [--no-system-dependencies-check] [--] [<requested-package-and-version>]

The second case may be something we just don't want to support; since if you're using a non-stable version of PHP you probably know how to bundle extensions up anyway; and in those cases, we would really need to get the exact commit/sha of what you built - which may not actually be correct, if you built from a php-src with uncommitted changes...