It's a bit of an information leak, but probably not a particularly serious one. It just gives some information about what tech stack they're using, which isn't

It's a bit of an information leak, but probably not a particularly serious one. It just gives some information about what tech stack they're using, which isn't really public but also not that hard to find out, and maybe a bit about where an attacker would want to look for other sensitive stuff. Pretty minor really, on its own. It is a bit embarrassing because most web servers (and deployment setups) shouldn't be publishing/serving dot files anyway (files with names beginning with dot). But it's not necessarily a problem as long as they have some protection to avoid the _really_ sensitive stuff leaking, it's just kind of funny.