Merge pull request #304 from python-trio/dependabot/add-v2-config-file

Upgrade to GitHub-native Dependabot

.github/dependabot.yml

@@ -0,0 +1,27 @@
+version: 2
+updates:
+- package-ecosystem: pip
+  directory: "/"
+  schedule:
+    interval: daily
+  open-pull-requests-limit: 10
+  versioning-strategy: lockfile-only
+  allow:
+  - dependency-type: direct
+  - dependency-type: indirect
+  ignore:
+  - dependency-name: cryptography
+    versions:
+    - ">= 3.a, < 4"
+  - dependency-name: importlib-metadata
+    versions:
+    - ">= 3.a, < 4"
+  - dependency-name: pytest
+    versions:
+    - ">= 5.a, < 6"
+  - dependency-name: pytest
+    versions:
+    - ">= 6.a, < 7"
+  - dependency-name: importlib-metadata
+    versions:
+    - 4.0.0