ci(dependabot): group testcontainers with testcontainers-modules (#598)

testcontainers-modules pins a specific testcontainers version, so the two
must be bumped together. Ungrouped, dependabot opened them as separate PRs
(#585, #590) and each split the testcontainers version in the dependency
graph, failing the e2e build. Grouping guarantees a single combined PR.

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: nolik

.github/dependabot.yml

@@ -5,6 +5,14 @@ updates:
     directory: "/"
     schedule:
       interval: daily
+    # testcontainers-modules pins a specific testcontainers version, so the two
+    # must be bumped together — otherwise each lone PR splits the testcontainers
+    # version in the dependency graph and fails to compile the e2e tests.
+    groups:
+      testcontainers:
+        patterns:
+          - "testcontainers"
+          - "testcontainers-modules"
 
   # Maintain dependencies for Docker
   - package-ecosystem: "docker"