[dependency]: bump spring.version from 4.3.30.RELEASE to 6.0.9 in /nis

Bumps `spring.version` from 4.3.30.RELEASE to 6.0.9.

Updates `spring-context` from 4.3.30.RELEASE to 6.0.9
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v4.3.30.RELEASE...v6.0.9)

Updates `spring-jdbc` from 4.3.30.RELEASE to 6.0.9
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v4.3.30.RELEASE...v6.0.9)

Updates `spring-orm` from 4.3.30.RELEASE to 6.0.9
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v4.3.30.RELEASE...v6.0.9)

Updates `spring-tx` from 4.3.30.RELEASE to 6.0.9
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v4.3.30.RELEASE...v6.0.9)

Updates `spring-webmvc` from 4.3.30.RELEASE to 6.0.9
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v4.3.30.RELEASE...v6.0.9)

Updates `spring-websocket` from 4.3.30.RELEASE to 6.0.9
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v4.3.30.RELEASE...v6.0.9)

Updates `spring-messaging` from 4.3.30.RELEASE to 6.0.9
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v4.3.30.RELEASE...v6.0.9)

Updates `spring-test` from 4.3.30.RELEASE to 6.0.9
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v4.3.30.RELEASE...v6.0.9)

---
updated-dependencies:
- dependency-name: org.springframework:spring-context
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: org.springframework:spring-jdbc
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: org.springframework:spring-orm
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: org.springframework:spring-tx
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: org.springframework:spring-webmvc
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: org.springframework:spring-websocket
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: org.springframework:spring-messaging
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: org.springframework:spring-test
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

nis/pom.xml

@@ -26,7 +26,7 @@
         <nemCodeBase>http://bob.nem.ninja/</nemCodeBase>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <jetty.version>9.4.43.v20210629</jetty.version>
-        <spring.version>4.3.30.RELEASE</spring.version>
+        <spring.version>6.0.9</spring.version>
     </properties>
 
     <dependencies>