chore(dependabot): Update config to bump v7.x

Also change bumping intervals to weekly since we want to avoid being
overloaded with PRs.

Signed-off-by: Carson Long <12767276+ctlong@users.noreply.github.com>

.github/dependabot.yml

@@ -4,19 +4,28 @@ updates:
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
-      interval: "daily"
+      interval: "weekly"
 
   # Maintain dependencies for Go Modules
   - package-ecosystem: "gomod"
     directory: "/src"
     schedule:
-      interval: "daily"
+      interval: "weekly"
   - package-ecosystem: "gomod"
     directory: "/src"
     target-branch: "v6.x"
     schedule:
-      interval: "daily"
+      interval: "weekly"
     labels:
     - "v6.x"
     - "go"
     - "dependencies"
+  - package-ecosystem: "gomod"
+    directory: "/src"
+    target-branch: "v7.x"
+    schedule:
+      interval: "weekly"
+    labels:
+    - "v7.x"
+    - "go"
+    - "dependencies"