Bump PHP minimum requirement to 8.0

PHPStan failed on 7.4 after updating to 0.12.99, and I figured it was less hassle to just do this than fix the build. In any case, we stopped shipping 7.4 months ago, and warned at 3.22 release that 7.4 support would soon be dropped.

.github/workflows/main.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       matrix:
         image: [ubuntu-20.04]
-        php: [7.4.24, 8.0.11]
+        php: [8.0.11]
 
     steps:
       - uses: actions/checkout@v2 #needed for build.sh
@@ -36,13 +36,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        include:
-          - php: 8.0.11
-            config: phpstan.neon.dist
-            image: ubuntu-20.04
-          - php: 7.4.24
-            config: phpstan.php7.neon
-            image: ubuntu-20.04
+        image: [ubuntu-20.04]
+        php: [8.0.11]
 
     steps:
       - uses: actions/checkout@v2
@@ -82,7 +77,7 @@ jobs:
         run: php composer.phar install --prefer-dist --no-interaction
 
       - name: Run PHPStan
-        run: ./vendor/bin/phpstan analyze --no-progress --memory-limit=2G -c ${{ matrix.config }}
+        run: ./vendor/bin/phpstan analyze --no-progress --memory-limit=2G
 
   phpunit:
     name: PHPUnit tests
@@ -92,7 +87,7 @@ jobs:
       fail-fast: false
       matrix:
         image: [ubuntu-20.04]
-        php: [7.4.24, 8.0.11]
+        php: [8.0.11]
 
     steps:
       - uses: actions/checkout@v2
@@ -142,7 +137,7 @@ jobs:
       fail-fast: false
       matrix:
         image: [ubuntu-20.04]
-        php: [7.4.24, 8.0.11]
+        php: [8.0.11]
 
     steps:
       - uses: actions/checkout@v2
@@ -194,7 +189,7 @@ jobs:
       fail-fast: false
       matrix:
         image: [ubuntu-20.04]
-        php: [7.4.24, 8.0.11]
+        php: [8.0.11]
 
     steps:
       - uses: actions/checkout@v2

.github/workflows/update-php-versions.php

@@ -22,8 +22,6 @@
 declare(strict_types=1);
 
 const VERSIONS = [
-	"7.3",
-	"7.4",
 	"8.0"
 ];