Use JGit from Boot.

pom.xml

@@ -34,7 +34,8 @@
 		<jcabi-github.version>1.1.2</jcabi-github.version>
 		<jsch-agent.version>0.0.9</jsch-agent.version>
 		<hibernate-validator.version>7.0.2.Final</hibernate-validator.version>
-		<org.eclipse.jgit-version>6.0.0.202111291000-r</org.eclipse.jgit-version>
+		<!--Matches JGit in Boot:-->
+		<org.eclipse.jgit-version>5.12.0.202106070339-r</org.eclipse.jgit-version>
 		<!-- Versions plugin uses this version -->
 		<maven-model.version>3.8.4</maven-model.version>
 		<versions-maven-plugin.version>2.7</versions-maven-plugin.version>

releaser-core/src/main/java/releaser/internal/git/GitRepo.java

@@ -56,12 +56,12 @@ import org.eclipse.jgit.revwalk.RevCommit;
 import org.eclipse.jgit.revwalk.RevWalk;
 import org.eclipse.jgit.transport.CredentialsProvider;
 import org.eclipse.jgit.transport.FetchResult;
+import org.eclipse.jgit.transport.JschConfigSessionFactory;
+import org.eclipse.jgit.transport.OpenSshConfig;
 import org.eclipse.jgit.transport.RefSpec;
 import org.eclipse.jgit.transport.SshTransport;
 import org.eclipse.jgit.transport.URIish;
 import org.eclipse.jgit.transport.UsernamePasswordCredentialsProvider;
-import org.eclipse.jgit.transport.ssh.jsch.JschConfigSessionFactory;
-import org.eclipse.jgit.transport.ssh.jsch.OpenSshConfig;
 import org.eclipse.jgit.util.FS;
 import org.eclipse.jgit.util.FileUtils;
 import org.slf4j.Logger;

releaser-core/src/test/java/releaser/internal/ReleaserTests.java

@@ -83,7 +83,7 @@ public class ReleaserTests {
 
 	File pom;
 
-	@Before
+	@BeforeEach
 	public void setup() throws URISyntaxException {
 		URI pomUri = ReleaserTests.class.getResource("/projects/project/pom.xml").toURI();
 		this.pom = new File(pomUri);

releaser-core/src/test/java/releaser/internal/github/GithubIssuesTests.java

@@ -16,7 +16,6 @@
 
 package releaser.internal.github;
 
-import java.io.File;
 import java.io.IOException;
 import java.util.Collections;