ci: update dependabot.yml with improved ignore rules (#2842)

Prevent incompatible updates to spring-cloud-starter-bootstrap and spring-cloud-config-dependencies, as occurred in https://togithub.com/GoogleCloudPlatform/spring-cloud-gcp/pull/2818

.github/dependabot.yml

@@ -47,12 +47,16 @@ updates:
     # Spring Cloud dependencies
     - dependency-name: "org.springframework.cloud:spring-cloud-dependencies"
       versions: ["2022.x", "2023.x"]
+    # spring-cloud-dependencies-parent should be eventually removed per #1294
+    - dependency-name: "org.springframework.cloud:spring-cloud-dependencies-parent"
+      versions: ["4.x"]
     - dependency-name: "org.springframework.cloud:spring-cloud-config"
       versions: ["4.x"]
+    - dependency-name: "org.springframework.cloud:spring-cloud-config-dependencies"
+      versions: ["4.x"]
     - dependency-name: "org.springframework.cloud:spring-cloud-function"
       versions: ["4.x"]
-    # spring-cloud-dependencies-parent should be eventually removed per #1294
-    - dependency-name: "org.springframework.cloud:spring-cloud-dependencies-parent"
+    - dependency-name: "org.springframework.cloud:spring-cloud-starter-bootstrap"
       versions: ["4.x"]
     # Spring Shell dependencies
     - dependency-name: "org.springframework.shell:spring-shell-starter"
@@ -89,8 +93,12 @@ updates:
       versions: ["2023.x"]
     - dependency-name: "org.springframework.cloud:spring-cloud-config"
       versions: [">=4.1.0"]
+    - dependency-name: "org.springframework.cloud:spring-cloud-config-dependencies"
+      versions: [">=4.1.0"]
     - dependency-name: "org.springframework.cloud:spring-cloud-function"
       versions: [">=4.1.0"]
+    - dependency-name: "org.springframework.cloud:spring-cloud-starter-bootstrap"
+      versions: [">=4.1.0"]
     # Spring Shell dependencies
     - dependency-name: "org.springframework.shell:spring-shell-starter"
       versions: [">=3.2.0"]