Ignore specific version of LibGit2Sharp in Dependabot

This change adds an ignore rule for version 0.31.0 of the LibGit2Sharp dependency in the Dependabot configuration file.

Author: arturcic

.github/dependabot.yml

@@ -32,6 +32,10 @@ updates:
     - "/new-cli"
     - "/src"
     - "/"
+  ignore:
+    - dependency-name: "LibGit2Sharp"
+      versions:
+        - "0.31.0"
   schedule:
     interval: daily
   open-pull-requests-limit: 10