chore: dependabot integration (#8357)

.github/dependabot.yml

@@ -0,0 +1,35 @@
+version: 2
+
+updates:
+  - package-ecosystem: "composer"
+    directory: "/dev-tools/"
+    commit-message:
+      prefix: "deps"
+    schedule:
+      interval: "weekly"
+      day: "friday"
+      time: "12:30"
+      timezone: "Europe/Warsaw"
+    versioning-strategy: increase
+    groups:
+      phpstan:
+        patterns:
+          - "phpstan/*"
+  - package-ecosystem: "docker"
+    directory: "/"
+    commit-message:
+      prefix: "deps"
+    schedule:
+      interval: "weekly"
+      day: "friday"
+      time: "12:30"
+      timezone: "Europe/Warsaw"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    commit-message:
+      prefix: "deps"
+    schedule:
+      interval: "weekly"
+      day: "friday"
+      time: "12:30"
+      timezone: "Europe/Warsaw"