Bump com.google.cloud.tools:jib-core from 0.27.3 to 0.28.1 in /core

Bumps [com.google.cloud.tools:jib-core](https://github.com/GoogleContainerTools/jib) from 0.27.3 to 0.28.1.
- [Release notes](https://github.com/GoogleContainerTools/jib/releases)
- [Commits](https://github.com/GoogleContainerTools/jib/commits)

---
updated-dependencies:
- dependency-name: com.google.cloud.tools:jib-core
  dependency-version: 0.28.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

core/build.gradle

@@ -70,7 +70,7 @@ dependencies {
         exclude(group: 'org.jetbrains', module: 'annotations')
     }
 
-    provided('com.google.cloud.tools:jib-core:0.27.3') {
+    provided('com.google.cloud.tools:jib-core:0.28.1') {
         exclude group: 'com.google.guava', module: 'guava'
         exclude group: 'com.fasterxml.jackson.datatype', module: 'jackson-datatype-jsr310'
         exclude group: 'com.fasterxml.jackson.core', module: 'jackson-core'
@@ -101,7 +101,7 @@ dependencies {
     testRuntimeOnly 'org.junit.platform:junit-platform-launcher:1.11.0'
 
     testImplementation 'org.junit.jupiter:junit-jupiter:5.13.4'
-    testImplementation('com.google.cloud.tools:jib-core:0.27.3')  {
+    testImplementation('com.google.cloud.tools:jib-core:0.28.1')  {
         exclude group: 'com.google.guava', module: 'guava'
     }
     testImplementation 'org.apache.httpcomponents:httpclient:4.5.14'