Upgrade rust/crates/regex to 1.3.7

Test: None
Change-Id: I26e69e1c8997da756f5da7bbd70727375ccf1d5d
diff --git a/Cargo.toml b/Cargo.toml
index b5d3725..0b2f0b9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,7 +12,7 @@
 
 [package]
 name = "regex"
-version = "1.3.6"
+version = "1.3.7"
 authors = ["The Rust Project Developers"]
 exclude = ["/scripts/*", "/.github/*"]
 autotests = false
@@ -100,7 +100,7 @@
 version = "0.6.5"
 
 [features]
-default = ["std", "perf", "unicode"]
+default = ["std", "perf", "unicode", "regex-syntax/default"]
 pattern = []
 perf = ["perf-cache", "perf-dfa", "perf-inline", "perf-literal"]
 perf-cache = ["thread_local"]
@@ -108,7 +108,7 @@
 perf-inline = []
 perf-literal = ["aho-corasick", "memchr"]
 std = []
-unicode = ["unicode-age", "unicode-bool", "unicode-case", "unicode-gencat", "unicode-perl", "unicode-script", "unicode-segment"]
+unicode = ["unicode-age", "unicode-bool", "unicode-case", "unicode-gencat", "unicode-perl", "unicode-script", "unicode-segment", "regex-syntax/unicode"]
 unicode-age = ["regex-syntax/unicode-age"]
 unicode-bool = ["regex-syntax/unicode-bool"]
 unicode-case = ["regex-syntax/unicode-case"]