use PHP 8 for CI jobs

.github/workflows/build_scoped_rector.yaml

@@ -25,7 +25,7 @@ jobs:
             -
                 uses: shivammathur/setup-php@v2
                 with:
-                    php-version: 7.3
+                    php-version: 8.0
                     coverage: none
 
                 # fixes https://github.com/rectorphp/rector/pull/4559/checks?check_run_id=1359814403, see https://github.com/shivammathur/setup-php#composer-github-oauth

.github/workflows/code_analysis.yaml

@@ -46,7 +46,7 @@ jobs:
             -
                 uses: shivammathur/setup-php@v2
                 with:
-                    php-version: 7.3
+                    php-version: 8.0
                     coverage: none
 
             -   uses: "ramsey/composer-install@v1"

.github/workflows/packages_tests.yaml

@@ -36,7 +36,7 @@ jobs:
             -
                 uses: shivammathur/setup-php@v2
                 with:
-                    php-version: 7.3
+                    php-version: 8.0
                     coverage: none
 
             -

.github/workflows/php_linter.yaml

@@ -17,7 +17,7 @@ jobs:
             -
                 uses: shivammathur/setup-php@v2
                 with:
-                    php-version: 7.3
+                    php-version: 8.0
                     coverage: none
 
             -   run: composer create-project php-parallel-lint/php-parallel-lint php-parallel-lint

.github/workflows/rector.yaml

@@ -48,7 +48,7 @@ jobs:
                 uses: shivammathur/setup-php@v2
                 with:
                     # PHP 7.3 is required, so Rector's code is PHP 7.3 compatible even after refactoring
-                    php-version: 7.3
+                    php-version: 8.0
                     coverage: none
 
             -   run: composer install --no-progress --ansi