dependabot.yml: consistency updates.

Let's update this to be more consistent with the other `dependabot.yml`
files in the Homebrew organization.

.github/dependabot.yml

@@ -5,6 +5,8 @@ updates:
     directory: /
     schedule:
       interval: daily
+    allow:
+      - dependency-type: all
     # The actions in triage-issues.yml are updated in the Homebrew/.github repo
     ignore:
       - dependency-name: actions/stale
@@ -20,4 +22,31 @@ updates:
       interval: daily
     allow:
       - dependency-type: all
-    versioning-strategy: lockfile-only
+
+  - package-ecosystem: npm
+    directory: /
+    schedule:
+      interval: daily
+    allow:
+      - dependency-type: all
+
+  - package-ecosystem: docker
+    directory: /
+    schedule:
+      interval: daily
+    allow:
+      - dependency-type: all
+
+  - package-ecosystem: devcontainers
+    directory: /
+    schedule:
+      interval: daily
+    allow:
+      - dependency-type: all
+
+  - package-ecosystem: pip
+    directory: /
+    schedule:
+      interval: daily
+    allow:
+      - dependency-type: all