Bump maven-release-plugin from 3.0.0-M6 to 3.0.0-M7 (#530)

Bumps [maven-release-plugin](https://github.com/apache/maven-release) from 3.0.0-M6 to 3.0.0-M7.
- [Release notes](https://github.com/apache/maven-release/releases)
- [Commits](apache/maven-release@maven-release-3.0.0-M6...maven-release-3.0.0-M7)

---
updated-dependencies:
- dependency-name: org.apache.maven.plugins:maven-release-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

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

Author: dependabot[bot]

pom.xml

@@ -383,7 +383,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-release-plugin</artifactId>
-                <version>3.0.0-M6</version>
+                <version>3.0.0-M7</version>
                 <configuration>
                     <connectionUrl>scm:git:https://github.com/spring-projects-experimental/spring-boot-migrator.git</connectionUrl>
                     <autoVersionSubmodules>true</autoVersionSubmodules>