Bump scm-api from 2.2.6 to 2.6.4

Bumps [scm-api](https://github.com/jenkinsci/scm-api-plugin) from 2.2.6 to 2.6.4.
- [Release notes](https://github.com/jenkinsci/scm-api-plugin/releases)
- [Changelog](https://github.com/jenkinsci/scm-api-plugin/blob/master/CHANGELOG.md)
- [Commits](jenkinsci/scm-api-plugin@scm-api-2.2.6...scm-api-2.6.4)

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

pom.xml

@@ -118,7 +118,7 @@
         <dependency>
             <groupId>org.jenkins-ci.plugins</groupId>
             <artifactId>scm-api</artifactId>
-            <version>2.2.6</version>
+            <version>2.6.4</version>
             <scope>test</scope>
         </dependency>
         <dependency>