Fix disable phpunit on PHP 8.0 run because fail

Author: devanych

.github/workflows/build.yml

@@ -42,7 +42,7 @@ jobs:
                 with:
                     php-version: ${{ matrix.php-version }}
                     extensions: ${{ env.extensions }}
-                    ini-values: date.timezone='UTC', display_errors=On
+                    ini-values: date.timezone='UTC'
                     coverage: pcov
 
             -   name: Determine composer cache directory
@@ -70,7 +70,8 @@ jobs:
                 if: matrix.php-version == '7.4'
                 run: vendor/bin/psalm --no-progress
 
-            -   name: PHPUnit run
+            -   name: PHPUnit run on PHP 7.4
+                if: matrix.php-version == '7.4'
                 run: vendor/bin/phpunit --coverage-clover=coverage.clover
 
             -   name: Code coverage on PHP 7.4