update php support to 7.4

Author: sokil

.github/workflows/continuous-integration.yml

@@ -13,9 +13,6 @@ jobs:
     strategy:
       matrix:
         php-version:
-          - "7.1"
-          - "7.2"
-          - "7.3"
           - "7.4"
           - "8.0"
           - "8.1"
@@ -37,7 +34,7 @@ jobs:
 
     - name: Cache Composer packages
       id: composer-cache
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: vendor
         key: ${{ runner.os }}-php-composer-${{ matrix.php-version }}-${{ hashFiles('**/composer.lock') }}

composer.json

@@ -9,7 +9,7 @@
         }
     ],
     "require": {
-        "php": ">=7.1",
+        "php": ">=7.4",
         "ext-json": "*"
     },
     "require-dev": {