fix: quote wrapper's title_text is now a semantic h2. (#5427)

Author: jmuzina

package.json

@@ -1,6 +1,6 @@
 {
   "name": "vanilla-framework",
-  "version": "4.18.3",
+  "version": "4.18.4",
   "author": {
     "email": "webteam@canonical.com",
     "name": "Canonical Webteam"

templates/_macros/vf_quote-wrapper.jinja

@@ -99,7 +99,7 @@
           {%- if has_title %}
             {#- Optional heading text -#}
             <div class="col-3 col-medium-2">
-              <p class="p-muted-heading">{{ title_text }}</p>
+              <h2 class="p-muted-heading">{{ title_text }}</h2>
             </div>
           {%- endif -%}