chore: remove psalm

.gitattributes

@@ -7,8 +7,6 @@
 /.editorconfig export-ignore
 /.travis.yml export-ignore
 /appveyor.yml export-ignore
-/psalm.baseline.xml export-ignore
-/psalm.xml export-ignore
 /bin export-ignore
 /doc export-ignore
 /docker export-ignore

.github/workflows/static.yml

@@ -53,28 +53,3 @@ jobs:
         run: |
           ./vendor/bin/php-cs-fixer --version
           ./vendor/bin/php-cs-fixer fix --diff --dry-run --show-progress=none
-
-  psalm:
-    name: Psalm
-    runs-on: ubuntu-latest
-    steps:
-      - name: Set up PHP
-        uses: shivammathur/setup-php@v2
-        with:
-          php-version: '7.4'
-          extensions: mongo, mbstring, fileinfo
-          tools: composer:v2
-
-      - name: Checkout code
-        uses: actions/checkout@v2
-
-      - name: Download dependencies
-        run: |
-          make require-all
-          composer require --dev --no-update psalm/phar:3.16
-          composer update --no-interaction --prefer-dist
-
-      - name: Psalm
-        run: |
-          ./vendor/bin/psalm.phar --version
-          ./vendor/bin/psalm.phar --output-format=github --no-progress --show-info=false --stats