feat!: remove Maintenance header link (#1526)

...by bumping frontend-component-header 5.7.0 -> 5.8.0

Our reasoning is that the two functions of the Studio Maintenance
dashboard (Announcements and Maintenance Banner) have been broken
for a while.

It's actually version 5.7.2 that removes the link [1] but since 5.8.0
has no breaking changes, it seemed prudent to jump straight to latest.

[1] https://github.com/openedx/frontend-component-header/releases/v5.7.2

Related PR: openedx/edx-platform#35852

package.json

@@ -50,7 +50,7 @@
     "@edx/brand": "npm:@openedx/brand-openedx@^1.2.3",
     "@edx/browserslist-config": "1.2.0",
     "@edx/frontend-component-footer": "^14.1.0",
-    "@edx/frontend-component-header": "^5.7.0",
+    "@edx/frontend-component-header": "^5.8.0",
     "@edx/frontend-enterprise-hotjar": "^2.0.0",
     "@edx/frontend-platform": "^8.0.3",
     "@edx/openedx-atlas": "^0.6.0",