fix: remove deprecated/unused plugins, set php to 8.1

Author: tedw

composer.json

@@ -14,35 +14,27 @@
     }
   ],
   "require": {
-    "php": ">=7.3",
-    "composer/installers": "^1.3.0",
+    "php": ">=8.1",
+    "composer/installers": "^1.12.0",
     "pantheon-systems/quicksilver-pushback": "^2",
     "pantheon-systems/wordpress-composer": "*",
-    "roots/wp-password-bcrypt": "^1.0.0",
-    "vlucas/phpdotenv": "^3.1.0",
-    "wpackagist-plugin/lh-hsts": "^1.24",
-    "wpackagist-plugin/pantheon-advanced-page-cache": ">=0.3.0",
-    "wpackagist-plugin/wp-native-php-sessions": ">=0.6.9",
-    "wpackagist-theme/twentynineteen": "^1.2"
+    "roots/wp-password-bcrypt": "^1.1.0",
+    "vlucas/phpdotenv": "^5.4",
+    "wpackagist-plugin/pantheon-advanced-page-cache": "^1.0",
+    "wpackagist-plugin/wp-native-php-sessions": "^1.2",
+    "wpackagist-theme/twentytwentyfour": "^1.0"
   },
   "require-dev": {
-    "behat/mink-goutte-driver": "^1.2.1",
-    "brain/monkey": "^2.2.0",
-    "dealerdirect/phpcodesniffer-composer-installer": "^0.7",
-    "genesis/behat-fail-aid": "^2.1",
-    "paulgibbs/behat-wordpress-extension": "^3.3.0",
-    "phpunit/phpunit": "^7.5.1",
-    "roave/security-advisories": "dev-master",
-    "squizlabs/php_codesniffer": "^3.4.0",
-    "wp-coding-standards/wpcs": "^1.2.1"
+    "squizlabs/php_codesniffer": "^3.6.2",
+    "roave/security-advisories": "dev-latest"
   },
   "config": {
     "vendor-dir": "vendor",
     "preferred-install": "dist",
     "optimize-autoloader": true,
     "sort-packages": true,
     "platform": {
-      "php": "7.3"
+      "php": "8.1"
     },
     "allow-plugins": {
       "composer/installers": true,