Drop symfony 3.4 support (#2352)

Author: dereuromark

composer.json

@@ -40,7 +40,7 @@
         "composer-runtime-api": "^2.0",
         "cakephp/database": "^5.0.2",
         "psr/container": "^1.1|^2.0",
-        "symfony/config": "^3.4|^4.0|^5.0|^6.0|^7.0",
+        "symfony/config": "^4.0|^5.0|^6.0|^7.0",
         "symfony/console": "^6.0|^7.0"
     },
     "require-dev": {
@@ -49,7 +49,7 @@
         "cakephp/cakephp-codesniffer": "^5.0",
         "cakephp/i18n": "^5.0",
         "phpunit/phpunit": "^9.5.19",
-        "symfony/yaml": "^3.4|^4.0|^5.0|^6.0|^7.0"
+        "symfony/yaml": "^4.0|^5.0|^6.0|^7.0"
     },
     "autoload": {
         "psr-4": {