Update dependabot and Gradle files

This commit changes the dependency-management plugin in Gradle
build files so that the version number is not set excplicitly
but rather managed by Boot.

.github/dependabot.yml

@@ -1,37 +1,32 @@
 version: 2
 updates:
-  - package-ecosystem: "maven"
-    directory: "/initial/"
-    ignore:
-      - dependency-name: "*"
-        update-types: ["version-update:semver-patch"]
-    schedule:
-      interval: "monthly"
-    target-branch: "main"
-
-  - package-ecosystem: "gradle"
-    directory: "/initial/"
-    ignore:
-      - dependency-name: "org.springframework.*"
-        update-types: ["version-update:semver-patch"]
-    schedule:
-      interval: "monthly"
-    target-branch: "main"
 
   - package-ecosystem: "maven"
-    directory: "/complete/"
+    directories:
+      - "/initial"
+      - "/complete"
     ignore:
       - dependency-name: "*"
         update-types: ["version-update:semver-patch"]
     schedule:
       interval: "monthly"
     target-branch: "main"
+    groups:
+      guide-dependencies-maven:
+        patterns:
+          - "*"
 
   - package-ecosystem: "gradle"
-    directory: "/complete/"
+    directories:
+      - "/initial"
+      - "/complete"
     ignore:
-      - dependency-name: "org.springframework.*"
+      - dependency-name: "*"
         update-types: ["version-update:semver-patch"]
     schedule:
       interval: "monthly"
     target-branch: "main"
+    groups:
+      guide-dependencies-gradle:
+        patterns:
+          - "*"

complete/build.gradle

@@ -1,9 +1,10 @@
 plugins {
 	id 'org.springframework.boot' version '3.3.0'
-	id 'io.spring.dependency-management' version '1.1.5'
 	id 'java'
 }
 
+apply plugin: 'io.spring.dependency-management'
+
 group = 'com.example'
 version = '0.0.1-SNAPSHOT'
 sourceCompatibility = '17'

initial/build.gradle

@@ -1,9 +1,10 @@
 plugins {
 	id 'org.springframework.boot' version '3.3.0'
-	id 'io.spring.dependency-management' version '1.1.5'
 	id 'java'
 }
 
+apply plugin: 'io.spring.dependency-management'
+
 group = 'com.example'
 version = '0.0.1-SNAPSHOT'
 sourceCompatibility = '17'