[JENKINS-65175] Revert ini4j upgrade

[jglick]

JENKINS-65175: reverts #157.

The cleaner fix would likely be that suggested in a duplicate JENKINS-66997:

diff --git a/src/main/java/hudson/plugins/mercurial/MercurialSCM.java b/src/main/java/hudson/plugins/mercurial/MercurialSCM.java
index e11cd3b..9d8b37f 100755
--- a/src/main/java/hudson/plugins/mercurial/MercurialSCM.java
+++ b/src/main/java/hudson/plugins/mercurial/MercurialSCM.java
@@ -813,6 +813,7 @@ public class MercurialSCM extends SCM implements Serializable {
                 if (hgrc.exists()) {
                     try (InputStream is = hgrc.read()) {
                         Ini hgrcIni = new Ini(is);
+                        hgrcIni.getConfig().setEscape(false);
                         hgrcIni.put("paths", "default", getSource(env));
                         try (OutputStream os = hgrc.write()) {
                             hgrcIni.store(os);

plus some other points where ini4j is used. However, I do not have a self-contained test case to guard against regression, so simply reverting to the last library version thought to be unproblematic seems safer.

[KostyaSha]

maybe needs some comment for future update attempts?

[jglick]

Kept that in the Dependabot config.