Update to latest compatible regex version

Cargo.lock

@@ -4,9 +4,9 @@ version = 3
 
 [[package]]
 name = "aho-corasick"
-version = "0.7.18"
+version = "0.7.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e37cfd5e7657ada45f742d6e99ca5788580b5c529dc78faf11ece6dc702656f"
+checksum = "cc936419f96fa211c1b9166887b38e5e40b19958e5b895be7c1f93adec7071ac"
 dependencies = [
  "memchr",
 ]
@@ -636,9 +636,9 @@ dependencies = [
 
 [[package]]
 name = "regex"
-version = "1.5.6"
+version = "1.7.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d83f127d94bdbcda4c8cc2e50f6f84f4b611f69c902699ca385a39c3a75f9ff1"
+checksum = "8b1f693b24f6ac912f4893ef08244d70b6067480d2f1a46e950c9691e6749d1d"
 dependencies = [
  "aho-corasick",
  "memchr",
@@ -653,9 +653,9 @@ checksum = "6c230d73fb8d8c1b9c0b3135c5142a8acee3a0558fb8db5cf1cb65f8d7862132"
 
 [[package]]
 name = "regex-syntax"
-version = "0.6.26"
+version = "0.6.29"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "49b3de9ec5dc0a3417da371aab17d729997c15010e7fd24ff707773a33bddb64"
+checksum = "f162c6dd7b008981e4d40210aca20b4bd0f9b60ca9271061b07f78537722f2e1"
 
 [[package]]
 name = "rustc-hash"

Cargo.toml

@@ -28,7 +28,8 @@ pkg-url = "{ repo }/releases/download/{ version }/difft-{ target }.{ archive-for
 pkg-fmt = "zip"
 
 [dependencies]
-regex = "1.5.4"
+# This is the last version that supports rust 1.57, regex 1.8 requires rust 1.60.
+regex = ">= 1.7, < 1.8"
 clap = { version = "3.1.8", features = ["cargo", "env", "wrap_help"] }
 itertools = "0.10.1"
 typed-arena = "2.0.1"
@@ -48,6 +49,7 @@ walkdir = "2.3.3"
 const_format = "0.2.22"
 owo-colors = "3.3.0"
 wu-diff = "0.1.2"
+# rayon 1.7 requires rust 1.59
 rayon = "1.6.1"
 tree_magic_mini = "3.0.2"
 bumpalo = "3.11.1"