Drop support for anything but PHP 8.3

.github/workflows/deploy.yaml

@@ -24,7 +24,7 @@ jobs:
           # It's important to use the lowest supported PHP version when building the release-tool.
           # Otherwise, users can be confronted with a composer platform check error when they use
           # a PHP version that's lower than the version used here to build the release-tool.
-          php-version: '7.4'
+          php-version: '8.3'
 
       - name: Composer Install
         uses: ramsey/composer-install@v2

.github/workflows/nightly.yaml

@@ -16,7 +16,7 @@ jobs:
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: '7.4'
+          php-version: '8.3'
 
       - name: Composer Install
         uses: ramsey/composer-install@v2
@@ -33,7 +33,7 @@ jobs:
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: '7.4'
+          php-version: '8.3'
 
       - name: Security checks
         run: make security-tests

.github/workflows/test.yaml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        php: [ 7.4, 8.0, 8.1 ]
+        php: [ 8.3 ]
 
     steps:
       - name: checkout

composer.json

@@ -4,7 +4,7 @@
     "description": "Command line tool for releasing new versions of a project",
     "license": "MIT",
     "require": {
-        "php": "^7.4 || ^8.0, <8.2",
+        "php": "^8.3",
         "beberlei/assert": "^3.2",
         "consolidation/self-update": "^2.0",
         "guzzlehttp/guzzle": "^6.3",