Latest Vale version breaks Headings test fixtures

[aireilly]

Specifically: https://github.com/redhat-documentation/vale-at-red-hat/blob/main/.vale/fixtures/RedHat/Headings/testvalid.adoc?plain=1#L17

┌───── ~/vale-at-red-hat/.vale/fixtures/RedHat/Headings (fix-tests)
$ vale .
                                  
 testvalid.adoc
 17:4  suggestion  Use sentence-style              RedHat.Headings 
                   capitalization in 'Spotify,                     
                   GraphQL, and Quiltflower are                    
                   proper nouns so uppercase in                    
                   headings is OK.'.