That was would be covered by either Dwarfs: Stone and Steel, from 1st ed. WFRP, which is as rare as rocking horse $hit. One of only about 3 or 4 WFRP books across all editions I've not been able to get. It was a late book in 1st, so would have been from Hogshead, and would be after the Dwars 4th Ed WFB book, but I imagine a bit of the background has changed since then.
Tome of Salvation from 2nd edition which covers the Empire human religions in great detail only has about half a page on the Dwarf gods. Basically each clan has an ancestor god, and then there are the Grungni the god of miners and artisans, also called The Maker in AoS. Grimnir the warrior god, popular with slayers, and therefore thought of as the slayer god. And Valaya the Protector, dwarven mother goddess
There may be something in the 3rd edition books, but I don't know the general contents of each of those like I do for 1st and 2nd.
And there isn't any mention other than names in the 4th ed core book
I guess that doesn't give you anything you don't know already.
Wait... reading a bit of holy days from Tome of Salvation
There is First Quaff (33rd Day of Pflugzeit) When in the season the beer for that year is tasted for the first time, and the taste can foretell how good or bad the next year will be.
Saga (33rd Day of Vorgeheim). A Sombre day of storytelling of ancestors slayers and ironbeards deeds.
Second Breech (33rd Day of Brauzeit) When the second batch of beer is tested,
Keg End (33rd Day of Vorehexen) When dwarfs must empty their kegs for the following year. Even humans celebrate this. It's basically drink until you run out of beer