Bump com.google.errorprone:error_prone_core from 2.27.1 to 2.28.0 (#630)

Bumps [com.google.errorprone:error_prone_core](https://github.com/google/error-prone) from 2.27.1 to 2.28.0.
- [Release notes](https://github.com/google/error-prone/releases)
- [Commits](google/error-prone@v2.27.1...v2.28.0)

---
updated-dependencies:
- dependency-name: com.google.errorprone:error_prone_core
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

core/build.gradle

@@ -46,7 +46,7 @@ dependencies {
 
     dependencies {
         errorproneJavac('com.google.errorprone:javac:9+181-r4173-1')
-        errorprone('com.google.errorprone:error_prone_core:2.27.1')
+        errorprone('com.google.errorprone:error_prone_core:2.28.0')
     }
 }
 

springboot-basic/build.gradle

@@ -10,9 +10,9 @@ dependencies {
     dependencies {
         errorproneJavac('com.google.errorprone:javac:9+181-r4173-1')
         if (JavaVersion.current().isJava11Compatible()) {
-            errorprone('com.google.errorprone:error_prone_core:2.27.1')
+            errorprone('com.google.errorprone:error_prone_core:2.28.0')
         } else {
-            errorprone('com.google.errorprone:error_prone_core:2.27.1')
+            errorprone('com.google.errorprone:error_prone_core:2.28.0')
         }
     }
 }

springboot/build.gradle

@@ -16,7 +16,7 @@ dependencies {
     testImplementation "org.springframework.boot:spring-boot-starter-test"
     dependencies {
         errorproneJavac('com.google.errorprone:javac:9+181-r4173-1')
-        errorprone('com.google.errorprone:error_prone_core:2.27.1')
+        errorprone('com.google.errorprone:error_prone_core:2.28.0')
     }
 }