Bump the gradle group in /codegen with 2 updates

Bumps the gradle group in /codegen with 2 updates: [software.amazon.smithy.gradle.smithy-base](https://github.com/smithy-lang/smithy-gradle-plugin) and [software.amazon.smithy.gradle.smithy-jar](https://github.com/smithy-lang/smithy-gradle-plugin).


Updates `software.amazon.smithy.gradle.smithy-base` from 1.3.0 to 1.4.0
- [Changelog](https://github.com/smithy-lang/smithy-gradle-plugin/blob/main/CHANGELOG.md)
- [Commits](smithy-lang/smithy-gradle-plugin@1.3.0...1.4.0)

Updates `software.amazon.smithy.gradle.smithy-jar` from 1.3.0 to 1.4.0
- [Changelog](https://github.com/smithy-lang/smithy-gradle-plugin/blob/main/CHANGELOG.md)
- [Commits](smithy-lang/smithy-gradle-plugin@1.3.0...1.4.0)

Updates `software.amazon.smithy.gradle.smithy-jar` from 1.3.0 to 1.4.0
- [Changelog](https://github.com/smithy-lang/smithy-gradle-plugin/blob/main/CHANGELOG.md)
- [Commits](smithy-lang/smithy-gradle-plugin@1.3.0...1.4.0)

---
updated-dependencies:
- dependency-name: software.amazon.smithy.gradle.smithy-base
  dependency-version: 1.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: gradle
- dependency-name: software.amazon.smithy.gradle.smithy-jar
  dependency-version: 1.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: gradle
- dependency-name: software.amazon.smithy.gradle.smithy-jar
  dependency-version: 1.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: gradle
...

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

Author: dependabot[bot]

codegen/gradle/libs.versions.toml

@@ -5,7 +5,7 @@ mockito = "5.21.0"
 test-logger-plugin = "4.0.0"
 spotbugs = "6.0.22"
 spotless = "8.2.1"
-smithy-gradle-plugins = "1.3.0"
+smithy-gradle-plugins = "1.4.0"
 dep-analysis = "3.5.1"
 jsoup = "1.22.1"
 commonmark = "0.17.0"