nuget-to-json: use --netrc-optional for curl

Fixes: #389194
(cherry picked from commit 7a36c0ef0b08e07afec4f5300956941db2945efa)

pkgs/by-name/nu/nuget-to-json/nuget-to-json.sh

@@ -37,7 +37,7 @@ for index in "${sources[@]}"; do
     remote_sources+=("$index")
 
     base_address=$(
-        curl --compressed --netrc -fsSL "$index" |
+        curl --compressed --netrc-optional -fsSL "$index" |
             jq -r '.resources[] | select(."@type" == "PackageBaseAddress/3.0.0")."@id"'
     )
     if [[ ! "$base_address" == */ ]]; then