Update CI. (#108)

* Add 8.3 matrix

* Adjust dependabot indentation

Author: richardbporter

.github/dependabot.yml

@@ -1,18 +1,20 @@
 version: 2
 updates:
-- package-ecosystem: composer
-  directory: "/"
-  schedule:
-    interval: monthly
-  reviewers:
-    - richardbporter
-- package-ecosystem: github-actions
-  directory: "/"
-  schedule:
-    interval: monthly
-  reviewers:
-    - richardbporter
-- package-ecosystem: devcontainers
-   directory: "/"
-   schedule:
-     interval: monthly
+  - package-ecosystem: composer
+    directory: "/"
+    schedule:
+      interval: monthly
+    reviewers:
+      - richardbporter
+  - package-ecosystem: github-actions
+    directory: "/"
+    schedule:
+      interval: monthly
+    reviewers:
+      - richardbporter
+  - package-ecosystem: devcontainers
+    directory: "/"
+    schedule:
+      interval: monthly
+    reviewers:
+      - richardbporter

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php: [8.1, 8.2]
+        php: [8.1, 8.2, 8.3]
     steps:
     - uses: actions/checkout@v4
     - name: Start MySQL