fix: unescaped / in quoted type tests

[danini-the-panini]

There seem to be a few test cases that have a / in a quoted string used in a type annotation, which I believe is meant to be escaped. This differes from the all_escapes test case, which does escape the /.

[zkat]

Interesting. You shouldn't have to escape / in regular strings?

[hkolbeck]

I think / is weird in that it can be escaped, but doesn't have to be in other places as well. I think it's fine unescaped here.

[danini-the-panini]

I've proposed an alternate solution here: #197

[danini-the-panini]

Alternatively, #198