Bump org.apache.maven.plugins:maven-release-plugin in /spec

Bumps [org.apache.maven.plugins:maven-release-plugin](https://github.com/apache/maven-release) from 2.5.2 to 3.3.1.
- [Release notes](https://github.com/apache/maven-release/releases)
- [Commits](https://github.com/apache/maven-release/compare/maven-release-2.5.2...maven-release-3.3.1)

---
updated-dependencies:
- dependency-name: org.apache.maven.plugins:maven-release-plugin
  dependency-version: 3.3.1
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

spec/pom.xml

diff --git a/spec/pom.xml b/spec/pom.xml
index d21434b..c6e3644 100644
--- a/spec/pom.xml
+++ b/spec/pom.xml
@@ -160,7 +160,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-release-plugin</artifactId>
-                <version>2.5.2</version>
+                <version>3.3.1</version>
                 <configuration>
                     <mavenExecutorId>forked-path</mavenExecutorId>
                     <useReleaseProfile>false</useReleaseProfile>