perlPackages.Po4a: fix build

Backport of #72170
Related issue: #71296 (Po4a build get stuck in a loop)

Term::ReadKey is an optional dependency. From upstream:
> This module is used to retrieve the terminal's line width.
> If it is not present, the line width can be specified with the COLUMN environment variable.

pkgs/top-level/perl-packages.nix

@@ -12545,7 +12545,8 @@ let
       sha256 = "5010e1b7df1115cbd475f46587fc05fefc97301f9bba0c2f15106005ca017507";
     };
     nativeBuildInputs = [ pkgs.docbook_xsl pkgs.docbook_xsl pkgs.docbook_xsl_ns ];
-    propagatedBuildInputs = [ TextWrapI18N LocaleGettext TermReadKey SGMLSpm ModuleBuild UnicodeLineBreak ModuleBuild ];
+    propagatedBuildInputs = [ TextWrapI18N LocaleGettext SGMLSpm ModuleBuild UnicodeLineBreak ModuleBuild ];
+    # TermReadKey was removed from propagatedBuildInputs to unfreeze the build
     buildInputs = [ pkgs.gettext pkgs.libxslt pkgs.glibcLocales pkgs.docbook_xml_dtd_412 pkgs.docbook_sgml_dtd_41 pkgs.texlive.combined.scheme-basic pkgs.jade ];
     LC_ALL="en_US.UTF-8";
     SGML_CATALOG_FILES = "${pkgs.docbook_xml_dtd_412}/xml/dtd/docbook/catalog.xml";