Update Composer to 2.7.7 (along with other required dependency versions).

Closes #3454556

composer/Metapackage/CoreRecommended/composer.json

@@ -31,14 +31,14 @@
         "psr/log": "~3.0.0",
         "ralouphie/getallheaders": "~3.0.3",
         "sebastian/diff": "~4.0.6",
-        "symfony/console": "~v6.4.7",
+        "symfony/console": "~v6.4.8",
         "symfony/dependency-injection": "~v6.4.7",
         "symfony/deprecation-contracts": "~v3.5.0",
         "symfony/error-handler": "~v6.4.7",
         "symfony/event-dispatcher": "~v6.4.7",
         "symfony/event-dispatcher-contracts": "~v3.5.0",
-        "symfony/filesystem": "~v6.4.7",
-        "symfony/finder": "~v6.4.7",
+        "symfony/filesystem": "~v6.4.8",
+        "symfony/finder": "~v6.4.8",
         "symfony/http-foundation": "~v6.4.7",
         "symfony/http-kernel": "~v6.4.7",
         "symfony/mailer": "~v6.4.7",
@@ -50,12 +50,12 @@
         "symfony/polyfill-intl-normalizer": "~v1.29.0",
         "symfony/polyfill-mbstring": "~v1.29.0",
         "symfony/polyfill-php83": "~v1.29.0",
-        "symfony/process": "~v6.4.7",
+        "symfony/process": "~v6.4.8",
         "symfony/psr-http-message-bridge": "~v6.4.7",
         "symfony/routing": "~v6.4.7",
         "symfony/serializer": "~v6.4.7",
         "symfony/service-contracts": "~v3.5.0",
-        "symfony/string": "~v6.4.7",
+        "symfony/string": "~v6.4.8",
         "symfony/translation-contracts": "~v3.5.0",
         "symfony/validator": "~v6.4.7",
         "symfony/var-dumper": "~v6.4.7",