chore: remove deprecated `filter:admin/header.build` hook [breaking]

Use `filter:middleware.renderAdminHeader` instead.

src/middleware/admin.js

@@ -78,8 +78,6 @@ middleware.renderHeader = async (req, res, data) => {
 
 	templateValues.template = { name: res.locals.template };
 	templateValues.template[res.locals.template] = true;
-	// remove @1.17.0
-	({ templateData: templateValues } = await plugins.hooks.fire('filter:admin/header.build', { req, res, templateData: templateValues }));
 	({ templateData: templateValues } = await plugins.hooks.fire('filter:middleware.renderAdminHeader', {
 		req,
 		res,

src/plugins/hooks.js

@@ -10,7 +10,6 @@ module.exports = Hooks;
 
 Hooks.deprecatedHooks = {
 	'filter:privileges:isUserAllowedTo': 'filter:privileges:isAllowedTo',	// 👋 @ 1.17.0
-	'filter:admin/header.build': 'filter:middleware.renderAdminHeader',	// 👋 @ 1.17.0
 	'filter:router.page': 'response:router.page',	// 👋 @ 2.0.0
 };