Stop claiming that v2.48.1 is the latest version

In 4b51fcc (Migrate the home page to Hugo (and to Markdown),
2025-03-10), I had migrated also the header that talks about the current
Git for Windows version and where to find it.

Unfortunately, I forgot to update this partial template to take the
variable data from the site parameters, and instead still hard-coded
the version number and similar information.

So let's fix this ;-)

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

layouts/partials/header.html

@@ -1,7 +1,7 @@
 <header>
 	<nav class="content">
 		<a href="index.html"><h1 class="gittext lowercase">Git<span>for Windows</span></h1></a>
-		<div class="version"><a href="https://github.com/git-for-windows/git/releases/tag/v2.48.1.windows.1" title="Version 2.48.1 was published on Thu, 13 Feb 2025 12:50:46 UTC">Version 2.48.1</a></div>
+		<div class="version"><a href="{{ .Site.Params.url }}" title="Version {{ .Site.Params.version }} was published on {{ .Site.Params.publish_date }}">Version {{ .Site.Params.version }}</a></div>
 		<ul class="list-unstyled">
 			<li><a style="font-weight:bold" href="https://github.com/git-for-windows/git/wiki/FAQ" target="_blank">FAQ</a></li>
 			<li><a href="https://github.com/git-for-windows/git" target="_blank">Repository</a></li>