Bump svnkit from 1.8.12 to 1.10.3 (#117)

Bumps svnkit from 1.8.12 to 1.10.3.

---
updated-dependencies:
- dependency-name: org.tmatesoft.svnkit:svnkit
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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pom.xml

@@ -180,7 +180,7 @@
     <dependency>
       <groupId>org.tmatesoft.svnkit</groupId>
       <artifactId>svnkit</artifactId>
-      <version>1.8.12</version>
+      <version>1.10.3</version>
     </dependency>
     <dependency>
       <groupId>org.codehaus.plexus</groupId>