Enable dependabot to automatically get dependency updates

[MRamonLeon]

It would be great to have Dependabot configured to get dependencies updates filed automatically. This will help avoiding bugs or security vulnerabilities from old dependencies.

Some helpful documentation about Dependabot to fine adjust it if needed:

• Keeping your dependencies updated automatically: https://docs.github.com/en/free-pro-team@latest/github/administering-a-repository/keeping-your-dependencies-updated-automatically
• Avoiding security vulnerabilities: https://docs.github.com/en/free-pro-team@latest/github/managing-security-vulnerabilities/configuring-github-dependabot-security-updates
• Fine adjusting the configuration: https://docs.github.com/en/free-pro-team@latest/github/administering-a-repository/configuration-options-for-dependency-updates

[MRamonLeon]

cc: @batmat

[MRamonLeon]

Failure doesn't seem to be related:

 ERROR: Error cloning remote repo 'origin'
[2020-10-08T15:13:13.365Z] hudson.plugins.git.GitException: hudson.remoting.ProxyException: org.eclipse.jgit.errors.TranslationBundleLoadingException: Loading of translation bundle failed for [org.eclipse.jgit.internal.JGitText, en]
[2020-10-08T15:13:13.365Z] 	at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler.execute(RemoteGitImpl.java:148)
[2020-10-08T15:13:13.365Z] 	at jdk.internal.reflect.GeneratedMethodAccessor818.invoke(Unknown Source)
[2020-10-08T15:13:13.365Z] 	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[2020-10-08T15:13:13.365Z] 	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
[2020-10-08T15:13:13.365Z] 	at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler.invoke(RemoteGitImpl.java:132)
[2020-10-08T15:13:13.365Z] 	at com.sun.proxy.$Proxy384.execute(Unknown Source)
[2020-10-08T15:13:13.365Z] 	at hudson.plugins.git.GitSCM.retrieveChanges(GitSCM.java:1219)
[2020-10-08T15:13:13.365Z] 	at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1297)
[2020-10-08T15:13:13.365Z] 	at org.jenkinsci.plugins.workflow.steps.scm.SCMStep.checkout(SCMStep.java:125)
[2020-10-08T15:13:13.365Z] 	at org.jenkinsci.plugins.workflow.steps.scm.SCMStep$StepExecutionImpl.run(SCMStep.java:93)
[2020-10-08T15:13:13.365Z] 	at org.jenkinsci.plugins.workflow.steps.scm.SCMStep$StepExecutionImpl.run(SCMStep.java:80)
[2020-10-08T15:13:13.365Z] 	at org.jenkinsci.plugins.workflow.steps.SynchronousNonBlockingStepExecution.lambda$start$0(SynchronousNonBlockingStepExecution.java:47)
[2020-10-08T15:13:13.365Z] 	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
[2020-10-08T15:13:13.365Z] 	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[2020-10-08T15:13:13.365Z] 	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
[2020-10-08T15:13:13.365Z] 	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
[2020-10-08T15:13:13.365Z] 	at java.base/java.lang.Thread.run(Thread.java:834)
[2020-10-08T15:13:13.365Z] Caused by: hudson.remoting.ProxyException: org.eclipse.jgit.errors.TranslationBundleLoadingException: Loading of translation bundle failed for [org.eclipse.jgit.internal.JGitText, en]

[batmat]

reopening/retriggering

[batmat]

Infra failure on Windows. As a maintainer, I'll merge this anyway.