Bump the gradle group in /codegen with 2 updates (#633)

Bumps the gradle group in /codegen with 2 updates: gradle-wrapper and [com.diffplug.spotless:spotless-plugin-gradle](https://github.com/diffplug/spotless).


Updates `gradle-wrapper` from 9.0.0 to 9.3.0

Updates `com.diffplug.spotless:spotless-plugin-gradle` from 8.1.0 to 8.2.1
- [Release notes](https://github.com/diffplug/spotless/releases)
- [Changelog](https://github.com/diffplug/spotless/blob/main/CHANGES.md)
- [Commits](diffplug/spotless@gradle/8.1.0...gradle/8.2.1)

---
updated-dependencies:
- dependency-name: gradle-wrapper
  dependency-version: 9.3.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: gradle
- dependency-name: com.diffplug.spotless:spotless-plugin-gradle
  dependency-version: 8.2.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: gradle
...

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

Author: dependabot[bot]

codegen/gradle/libs.versions.toml

@@ -4,7 +4,7 @@ smithy = "1.66.0"
 mockito = "5.21.0"
 test-logger-plugin = "4.0.0"
 spotbugs = "6.0.22"
-spotless = "8.1.0"
+spotless = "8.2.1"
 smithy-gradle-plugins = "1.3.0"
 dep-analysis = "3.5.1"
 jsoup = "1.22.1"

codegen/gradle/wrapper/gradle-wrapper.jar

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-9.0.0-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.3.0-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME