Don't remove libidn2 prior to conversion.

Even though CentOS 7 has libidn2-2.3.7-1.el7.x86_64, which is higher
than AlmaLinux 8 version libidn2-2.2.0-1.el8.x86_64, it is correctly
downgraded on conversion.

Note that missing libidn2 might cause issues with dnf operation in case
upgraded libcurl is used.

centos2almaconverter/actions/packages.py

@@ -119,7 +119,6 @@ def __init__(self, temp_directory: str):
             "libwebp7": "libwebp",
             "libzip5": "libzip",
             "libytnef": "ytnef",
-            "libidn2": "libidn2",
             "lua-socket": "lua-socket",
         }