fix(card): add slotted header styles

per @marionnegp

also fixes demo page by importing cta

Author: bennypowers

elements/pfe-card/demo/pfe-card.js

@@ -1,5 +1,6 @@
 import '@patternfly/pfe-band';
 import '@patternfly/pfe-card';
+import '@patternfly/pfe-cta';
 import '@patternfly/pfe-select';
 
 const root = document.querySelector('[data-demo="pfe-card"]')?.shadowRoot ?? document;

elements/pfe-card/pfe-card.scss

@@ -266,3 +266,7 @@ $size-small: (
     }
   }
 }
+
+#header ::slotted(:is(h1,h2,h3,h4,h5,h6)) {
+  font-weight: var(--pfe-card-header-font-weight, 500);
+}