Update beberlei/assert for PHP 8 compatibility

Run `composer update beberlei/assert` using composer 2.3.8 on PHP 8.1.7

Updating other packages without updating this fails with:

```
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - beberlei/assert v3.2.2 requires php ^7 -> your php version (8.1.7) does not satisfy that requirement.
    - spomky-labs/otphp v10.0.1 requires beberlei/assert ^3.0 -> satisfiable by beberlei/assert[v3.2.2].
    - spomky-labs/otphp is locked to version v10.0.1 and an update of this package was not requested.
```

vendor/beberlei/assert/.github/workflows/ci.yml

@@ -0,0 +1,64 @@
+on: [push, pull_request]
+name: CI
+jobs:
+  tests:
+    name: Tests
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php-versions: ['7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1']
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v1
+
+    - name: Setup PHP
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: ${{ matrix.php-versions }}
+        tools: "cs2pr"
+
+    - name: "Cache dependencies installed with composer"
+      uses: "actions/cache@v1"
+      with:
+        path: "~/.composer/cache"
+        key: "php-${{ matrix.php-version }}-composer-locked-${{ hashFiles('composer.lock') }}"
+        restore-keys: "php-${{ matrix.php-version }}-composer-locked-"
+
+    - name: "Composer"
+      run: "composer update --prefer-stable"
+
+    - name: "PHPUnit"
+      run: "php vendor/bin/phpunit"
+
+# lint:
+#   name: Lint
+#   runs-on: ubuntu-latest
+
+#   steps:
+#   - name: Checkout
+#     uses: actions/checkout@v1
+
+#   - name: Setup PHP
+#     uses: shivammathur/setup-php@v2
+#     with:
+#       php-version: 7.4
+
+#   - name: "Cache dependencies installed with composer"
+#     uses: "actions/cache@v1"
+#     with:
+#       path: "~/.composer/cache"
+#       key: "php-${{ matrix.php-version }}-composer-locked-${{ hashFiles('composer.lock') }}"
+#       restore-keys: "php-${{ matrix.php-version }}-composer-locked-"
+
+#   - name: "Composer"
+#     run: "composer update --prefer-stable"
+
+#   - name: "assert:cs-lint"
+#     run: "composer assert:cs-lint"
+
+#   - name: "assert:sa-code"
+#     run: "composer assert:sa-code"
+
+#   - name: "assert:sa-tests"
+#     run: "composer assert:sa-tests"