Clean up renovate config around Spring Boot 2 package rules (#15322)

Author: trask

.github/renovate.json5

@@ -190,9 +190,7 @@
       enabled: false,
     },
     {
-      // intentionally using Spring Boot 2 in this smoke tests
-      // new versions of Spring Boot 3 are tested with
-      // https://github.com/open-telemetry/opentelemetry-java-instrumentation/blob/dc4330e0a3060bd7d8c4090ad0b8fc4727e68113/settings.gradle.kts#L43-L45
+      // intentionally using Spring Boot 2 in these smoke tests
       matchFileNames: [
         'smoke-tests/images/spring-boot/build.gradle.kts',
         'smoke-tests-otel-starter/spring-boot-2/build.gradle.kts',
@@ -203,42 +201,28 @@
       ],
       matchPackageNames: [
         'org.slf4j:slf4j-api',
-        'org.springframework.boot:org.springframework.boot.gradle.plugin', // this is for plugin id "org.springframework.boot"
-        'org.springframework.boot:spring-boot-dependencies',
+        'org.springframework.boot:**',
       ],
       matchUpdateTypes: [
         'major',
-        'minor',
       ],
       enabled: false,
     },
     {
-      // intentionally using Spring Boot 2 in this smoke tests
+      // intentionally using Logback 1.2 (for Spring Boot 2) in these smoke tests
       matchFileNames: [
+        'smoke-tests/images/spring-boot/build.gradle.kts',
         'smoke-tests-otel-starter/spring-boot-2/build.gradle.kts',
         'smoke-tests-otel-starter/spring-boot-reactive-2/build.gradle.kts',
       ],
       matchPackageNames: [
-        'ch.qos.logback:logback-classic',
-      ],
-      matchUpdateTypes: [
-        'minor',
-      ],
-      enabled: false,
-    },
-    {
-      // intentionally using logback 1.2 in this smoke tests
-      matchFileNames: [
-        'smoke-tests/images/spring-boot/build.gradle.kts',
+        'ch.qos.logback:**',
       ],
       matchUpdateTypes: [
         'major',
         'minor',
       ],
       enabled: false,
-      matchPackageNames: [
-        'ch.qos.logback:**',
-      ],
     },
     {
       // intentionally using slf4j 1 in this smoke tests