deps: initial migration steps to regex 1.9

This leaves the grep-regex crate in tatters. Pretty much the entire
thing needs to be re-worked. The upshot is that it should result in some
big simplifications. I hope.

The idea here is to drop down and actually use regex-automata 0.3
instead of the regex crate itself.

crates/regex/Cargo.toml

@@ -14,10 +14,10 @@ license = "Unlicense OR MIT"
 edition = "2018"
 
 [dependencies]
-aho-corasick = "0.7.3"
-bstr = "1.1.0"
+aho-corasick = "1.0.2"
+bstr = "1.5.0"
 grep-matcher = { version = "0.1.6", path = "../matcher" }
 log = "0.4.5"
-regex = "1.1"
-regex-syntax = "0.6.5"
-thread_local = "1.1.2"
+regex = "1.8.3"
+regex-syntax = "0.7.2"
+thread_local = "1.1.7"