Tweak Blueprint test string to match WP 6.8 (#117)

## Motivation for the change, related issues

A string in WP 6.8 changed from "Edit site" to "Edit Site" and broke a
unit test that depended on case-sensitive comparison. This PR fixes the
test.

## Implementation details

This PR simply changes the letter case in the unit test to accommodate
that.

## Testing Instructions (or ideally a Blueprint)

- CI

Author: brandonpayton

packages/playground/blueprints/src/lib/steps/login.spec.ts

@@ -42,7 +42,7 @@ describe('Blueprint step login', () => {
 			url: '/',
 		});
 		expect(response.httpStatusCode).toBe(200);
-		expect(response.text).toContain('Edit site');
+		expect(response.text).toContain('Edit Site');
 	});
 
 	it('should log the user into wp-admin', async () => {