Add dependabot config (#57)

Author: blink1073

.github/dependabot.yml

@@ -0,0 +1,20 @@
+version: 2
+updates:
+  # GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    groups:
+      actions:
+        patterns:
+          - "*"
+    assignees:
+      - "@mongodb/dbx-python"
+  # Python
+  - package-ecosystem: "pip"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    assignees:
+      - "@mongodb/dbx-python"

.github/workflows/test.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "pypy-3.7"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "pypy-3.10"]
       fail-fast: true
     steps:
       - uses: actions/checkout@v2