Fix compilation error

file-info/make-http-format is now private:

> Exception in thread "main" java.lang.IllegalStateException: var: #'ring.middleware.file-info/make-http-format is not public, compiling:(clj_webjars.clj:41:12)

Not sure accessing private vars is the best way to go, but fixes things for now.
Bump deps

Some of the dependencies are a bit outdated, might as well update?
Merge pull request #1 from emlyn/patch-1

Fix compilation error
Merge pull request #2 from emlyn/patch-2

Bump deps
Update clj_webjars.clj



https://github.com/ring-clojure/ring/commit/29064461e4e42c07224cbbc600a643bd85fd2f49#commitcomment-7300695