Bump exist.version from 5.0.0 to 5.1.0

Bumps `exist.version` from 5.0.0 to 5.1.0.

Updates `exist-core` from 5.0.0 to 5.1.0
- [Release notes](https://github.com/exist-db/exist/releases)
- [Changelog](https://github.com/eXist-db/exist/blob/develop/exist-versioning-release.md)
- [Commits](eXist-db/exist@eXist-5.0.0...eXist-5.1.0)

Updates `exist-expath` from 5.0.0 to 5.1.0
- [Release notes](https://github.com/exist-db/exist/releases)
- [Changelog](https://github.com/eXist-db/exist/blob/develop/exist-versioning-release.md)
- [Commits](eXist-db/exist@eXist-5.0.0...eXist-5.1.0)

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

Author: dependabot-preview[bot]

pom.xml

@@ -48,7 +48,7 @@
         <project.build.source>1.8</project.build.source>
         <project.build.target>1.8</project.build.target>
 
-        <exist.version>5.0.0</exist.version> <!-- change to 5.1.0-SNAPSHOT -->
+        <exist.version>5.1.0</exist.version> <!-- change to 5.1.0-SNAPSHOT -->
         <activemq.version>5.15.10</activemq.version>
         <commonspool2.version>2.7.0</commonspool2.version>
         <hawtbuf.version>1.11</hawtbuf.version>