Bump the opentelemetry group with 2 updates

Bumps the opentelemetry group with 2 updates: [io.opentelemetry.instrumentation:opentelemetry-instrumentation-bom](https://github.com/open-telemetry/opentelemetry-java-instrumentation) and [io.opentelemetry.instrumentation:gradle-plugins](https://github.com/open-telemetry/opentelemetry-java-instrumentation).


Updates `io.opentelemetry.instrumentation:opentelemetry-instrumentation-bom` from 2.26.1 to 2.28.1
- [Release notes](https://github.com/open-telemetry/opentelemetry-java-instrumentation/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-java-instrumentation/blob/main/CHANGELOG.md)
- [Commits](open-telemetry/opentelemetry-java-instrumentation@v2.26.1...v2.28.1)

Updates `io.opentelemetry.instrumentation:gradle-plugins` from 2.26.1-alpha to 2.28.1-alpha
- [Release notes](https://github.com/open-telemetry/opentelemetry-java-instrumentation/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-java-instrumentation/blob/main/CHANGELOG.md)
- [Commits](https://github.com/open-telemetry/opentelemetry-java-instrumentation/commits)

---
updated-dependencies:
- dependency-name: io.opentelemetry.instrumentation:opentelemetry-instrumentation-bom
  dependency-version: 2.28.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: opentelemetry
- dependency-name: io.opentelemetry.instrumentation:gradle-plugins
  dependency-version: 2.28.1-alpha
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: opentelemetry
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

buildSrc/build.gradle.kts

@@ -36,7 +36,7 @@ dependencies {
 
   implementation("org.owasp:dependency-check-gradle:12.2.1")
 
-  implementation("io.opentelemetry.instrumentation:gradle-plugins:2.26.1-alpha")
+  implementation("io.opentelemetry.instrumentation:gradle-plugins:2.28.1-alpha")
 
   implementation("net.ltgt.gradle:gradle-errorprone-plugin:5.1.0")
   implementation("net.ltgt.gradle:gradle-nullaway-plugin:3.0.0")

dependencyManagement/build.gradle.kts

@@ -9,7 +9,7 @@ rootProject.extra["versions"] = dependencyVersions
 
 val otelSdkVersion = "1.60.1"
 val otelInstrumentationAlphaVersion = "2.26.1-alpha"
-val otelInstrumentationVersion = "2.26.1"
+val otelInstrumentationVersion = "2.28.1"
 val otelContribVersion = "1.54.0"
 
 rootProject.extra["otelInstrumentationVersion"] = otelInstrumentationVersion