Enable dependabot and security scans (Delgan#677)

Co-authored-by: Delgan <delgan.py@gmail.com>

.github/dependabot.yml

@@ -0,0 +1,12 @@
+version: 2
+updates:
+- package-ecosystem: github-actions
+  directory: /
+  schedule:
+    interval: monthly
+- package-ecosystem: pip
+  directory: /
+  schedule:
+    interval: monthly
+  allow:
+  - dependency-type: direct

.github/workflows/codeql-analysis.yml

@@ -0,0 +1,30 @@
+name: CodeQL
+
+on:
+  push:
+  pull_request:
+  schedule:
+  - cron: 0 0 * * 0
+
+jobs:
+  analyze:
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [python]
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v3
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v2
+      with:
+        languages: ${{ matrix.language }}
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v2
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v2