Update the name of the class used to bold fonts

This was a breaking change in Bootstrap 5. See
https://getbootstrap.com/docs/5.2/migration/#utilities

layouts/partials/navbar.html

@@ -7,9 +7,12 @@
 */}}
 
 {{ $cover := .HasShortcode "blocks/cover" }}
-<nav class="js-navbar-scroll navbar navbar-expand navbar-light {{ if $cover}} td-navbar-cover {{ end }}flex-column flex-md-row td-navbar">
+<nav
+	class="js-navbar-scroll navbar navbar-expand navbar-light {{ if $cover}} td-navbar-cover {{ end }}flex-column flex-md-row td-navbar">
 	<a class="navbar-brand" href="{{ .Site.Home.RelPermalink }}">
-		<span class="navbar-logo">{{ with resources.Get "icons/logo.svg" }}{{ ( . | minify).Content | safeHTML }}{{ end }}</span><span class="font-weight-bold">specification</span><span class="navbar-version"> &mdash; {{ partial "version-string" . }}</span>
+		<span class="navbar-logo">{{ with resources.Get "icons/logo.svg" }}{{ ( . | minify).Content | safeHTML }}{{ end
+			}}</span><span class="fw-bold">specification</span><span class="navbar-version"> &mdash; {{ partial
+			"version-string" . }}</span>
 	</a>
 	<div class="td-navbar-nav-scroll ml-md-auto" id="main_navbar">
 		<ul class="navbar-nav mt-2 mt-lg-0">