github actions: update for new default branch
github actions: update for new default branch

beancount/fava,yagebu/fava,beancount/fava,yagebu/fava,aumayr/beancount-web,aumayr/beancount-web,beancount/fava,beancount/fava,yagebu/fava,aumayr/beancount-web,yagebu/fava,beancount/fava,aumayr/beancount-web,yagebu/fava