Keep track of core.alternateRefsCommand

src/plumbing/progress.rs

@@ -116,6 +116,10 @@ static GIT_CONFIG: &[Record] = &[
         config: "core.packedGitLimit",
         usage: NotApplicable { reason: "we target 32bit systems only and don't use a windowing mechanism" }
     },
+    Record {
+        config: "core.alternateRefsCommand",
+        usage: NotPlanned { reason: "there is no need as we can perform the required operation in-binary. This could happen though if there is a use-case and demand." }
+    },
     Record {
         config: "core.checkRoundtripEncoding",
         usage: Planned { note: Some("needed once working-tree-encoding attributes are supported") }