deps: update dependency com.google.cloud:sdk-platform-java-config to v3.28.0 (#1372)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:sdk-platform-java-config](https://togithub.com/googleapis/java-shared-config) | `3.27.0` -> `3.28.0` | [![age](https://developer.mend.io/api/mc/badges/age/maven/com.google.cloud:sdk-platform-java-config/3.28.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/maven/com.google.cloud:sdk-platform-java-config/3.28.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/maven/com.google.cloud:sdk-platform-java-config/3.27.0/3.28.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/com.google.cloud:sdk-platform-java-config/3.27.0/3.28.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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Author: renovate-bot

.kokoro/presubmit/graalvm-native-17.cfg

@@ -3,7 +3,7 @@
 # Configure the docker image for kokoro-trampoline.
 env_vars: {
   key: "TRAMPOLINE_IMAGE"
-  value: "gcr.io/cloud-devrel-public-resources/graalvm_sdk_platform_b:3.27.0"
+  value: "gcr.io/cloud-devrel-public-resources/graalvm_sdk_platform_b:3.28.0"
 }
 
 env_vars: {

.kokoro/presubmit/graalvm-native.cfg

@@ -3,7 +3,7 @@
 # Configure the docker image for kokoro-trampoline.
 env_vars: {
   key: "TRAMPOLINE_IMAGE"
-  value: "gcr.io/cloud-devrel-public-resources/graalvm_sdk_platform_a:3.27.0"
+  value: "gcr.io/cloud-devrel-public-resources/graalvm_sdk_platform_a:3.28.0"
 }
 
 env_vars: {

google-cloud-datastore-bom/pom.xml

@@ -8,7 +8,7 @@
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>sdk-platform-java-config</artifactId>
-    <version>3.27.0</version>
+    <version>3.28.0</version>
   </parent>
 
   <name>Google Cloud datastore BOM</name>

pom.xml

@@ -14,7 +14,7 @@
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>sdk-platform-java-config</artifactId>
-    <version>3.27.0</version>
+    <version>3.28.0</version>
   </parent>
 
   <developers>