Bump symfony/process from 5.4.8 to 5.4.21

Bumps [symfony/process](https://github.com/symfony/process) from 5.4.8 to 5.4.21.
- [Release notes](https://github.com/symfony/process/releases)
- [Changelog](https://github.com/symfony/process/blob/6.2/CHANGELOG.md)
- [Commits](https://github.com/symfony/process/compare/v5.4.8...v5.4.21)

---
updated-dependencies:
- dependency-name: symfony/process
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

composer.lock

@@ -4684,16 +4684,16 @@
         },
         {
             "name": "symfony/process",
-            "version": "v5.4.8",
+            "version": "v5.4.21",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/process.git",
-                "reference": "597f3fff8e3e91836bb0bd38f5718b56ddbde2f3"
+                "reference": "d4ce417ebcb0b7d090b4c178ed6d3accc518e8bd"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/process/zipball/597f3fff8e3e91836bb0bd38f5718b56ddbde2f3",
+                "url": "https://api.github.com/repos/symfony/process/zipball/d4ce417ebcb0b7d090b4c178ed6d3accc518e8bd",
-                "reference": "597f3fff8e3e91836bb0bd38f5718b56ddbde2f3",
+                "reference": "d4ce417ebcb0b7d090b4c178ed6d3accc518e8bd",
                 "shasum": ""
             },
             "require": {
@@ -4726,7 +4726,7 @@
             "description": "Executes commands in sub-processes",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/process/tree/v5.4.8"
+                "source": "https://github.com/symfony/process/tree/v5.4.21"
             },
             "funding": [
                 {
@@ -4742,7 +4742,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2022-04-08T05:07:18+00:00"
+            "time": "2023-02-21T19:46:44+00:00"
         },
         {
             "name": "symfony/routing",