Spelling Latin with u has always been there (but as a tiny minority of texts). Here are some occurrences of omnia uincit amor over the years: 1603, 1743, 1894, 1974.

If you compare the frequencies of vincit and uincit on Google Ngram viewer, you'll see that the u spelling has always been present at a low frequency. There doesn't seem to be any noticeable recent trend (other than the general decline of Latin as a proportion of printed material). I tried a few other Latin words and got similar results.