downgrade to kirby v3

vendor/filp/whoops/.github/FUNDING.yml

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+github: denis-sokolov

vendor/filp/whoops/.github/workflows/tests.yml

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+name: Tests
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  tests:
+    name: PHP ${{ matrix.php }}
+    runs-on: ubuntu-20.04
+
+    strategy:
+      matrix:
+        php: ['5.5', '5.6', '7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1']
+
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v2
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          tools: composer:v2
+          coverage: none
+        env:
+          update: true
+
+      - name: Setup Problem Matchers
+        run: echo "::add-matcher::${{ runner.tool_cache }}/phpunit.json"
+
+      - name: Fix PHPUnit Version PHP < 7.4
+        uses: nick-invision/retry@v1
+        with:
+          timeout_minutes: 5
+          max_attempts: 5
+          command: composer require "phpunit/phpunit:^4.8.36 || ^5.7.27 || ^6.5.14 || ^7.5.20 || ^8.5.8" --dev --no-update --no-interaction
+        if: "matrix.php < 7.4"
+
+      - name: Fix PHPUnit Version PHP >= 7.4
+        uses: nick-invision/retry@v1
+        with:
+          timeout_minutes: 5
+          max_attempts: 5
+          command: composer require "phpunit/phpunit:^9.3.3" --dev --no-update --no-interaction
+        if: "matrix.php >= 7.4"
+
+      - name: Install PHP Dependencies
+        uses: nick-invision/retry@v1
+        with:
+          timeout_minutes: 5
+          max_attempts: 5
+          command: composer update --no-interaction --no-progress
+
+      - name: Execute PHPUnit
+        run: vendor/bin/phpunit