Return simple composer.json. (yiisoft#113)

* Return simple composer.json.

.github/workflows/build.yml

@@ -64,7 +64,7 @@ jobs:
         run: composer self-update
 
       - name: Install dependencies with composer.
-        run: composer config preferred-install.yiisoft/db source && composer update --no-interaction --no-progress --optimize-autoloader --ansi
+        run: composer update --no-interaction --no-progress --optimize-autoloader --ansi
 
       - name: Run tests with phpunit with code coverage.
         run: vendor/bin/phpunit --coverage-clover=coverage.xml --colors=always

.github/workflows/mutation.yml

@@ -58,7 +58,7 @@ jobs:
           tools: composer:v2, pecl
 
       - name: Install dependencies with composer.
-        run: composer config preferred-install.yiisoft/db source && composer update --no-interaction --no-progress --optimize-autoloader --ansi
+        run: composer update --no-interaction --no-progress --optimize-autoloader --ansi
 
       - name: Run infection.
         run: |

composer.json

@@ -30,7 +30,6 @@
         "roave/infection-static-analysis-plugin": "^1.16",
         "spatie/phpunit-watcher": "^1.23",
         "vimeo/psalm": "^4.18",
-        "wikimedia/composer-merge-plugin": "^2.0",
         "yiisoft/aliases": "^2.0",
         "yiisoft/cache": "^2.0"
     },
@@ -41,26 +40,20 @@
     },
     "autoload-dev": {
         "psr-4": {
-            "Yiisoft\\Db\\Oracle\\Tests\\": "tests"
+            "Yiisoft\\Db\\Oracle\\Tests\\": "tests",
+            "Yiisoft\\Db\\Tests\\": "vendor/yiisoft/db/tests"
         }
     },
     "extra": {
         "branch-alias": {
             "dev-master": "1.0.x-dev"
-        },
-        "merge-plugin": {
-            "include": [
-                "composer.dev.json"
-            ],
-            "merge-dev": true
         }
     },
     "config": {
         "sort-packages": true,
         "allow-plugins": {
             "infection/extension-installer": true,
-            "composer/package-versions-deprecated": true,
-            "wikimedia/composer-merge-plugin": true
+            "composer/package-versions-deprecated": true
         }
     },
     "prefer-stable": true,