minor #30978 [HttpClient] Allow the HTTP_PROXY environment variable l…

…ookup with phpdbg (theofidry)

This PR was squashed before being merged into the 4.3-dev branch (closes #30978).

Discussion
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[HttpClient] Allow the HTTP_PROXY environment variable lookup with phpdbg

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | N/A
| License       | MIT
| Doc PR        | N/A

`phpdbg` and `embed` are two other legit PHP SAPI's hence should be allowed.

Commits
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fbd439e [HttpClient] Allow the HTTP_PROXY environment variable lookup with phpdbg

src/Symfony/Component/HttpClient/NativeHttpClient.php

@@ -258,7 +258,7 @@ private static function getProxy(?string $proxy, array $url): ?array
     {
         if (null === $proxy) {
             // Ignore HTTP_PROXY except on the CLI to work around httpoxy set of vulnerabilities
-            $proxy = $_SERVER['http_proxy'] ?? ('cli' === \PHP_SAPI ? $_SERVER['HTTP_PROXY'] ?? null : null) ?? $_SERVER['all_proxy'] ?? $_SERVER['ALL_PROXY'] ?? null;
+            $proxy = $_SERVER['http_proxy'] ?? (\in_array(\PHP_SAPI, ['cli', 'phpdbg'], true) ? $_SERVER['HTTP_PROXY'] ?? null : null) ?? $_SERVER['all_proxy'] ?? $_SERVER['ALL_PROXY'] ?? null;
 
             if ('https:' === $url['scheme']) {
                 $proxy = $_SERVER['https_proxy'] ?? $_SERVER['HTTPS_PROXY'] ?? $proxy;