Choose a version of assert_cmd that meets difftastic's MSRV

Cargo.lock

@@ -22,9 +22,9 @@ dependencies = [
 
 [[package]]
 name = "assert_cmd"
-version = "2.0.8"
+version = "2.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9834fcc22e0874394a010230586367d4a3e9f11b560f469262678547e1d2575e"
+checksum = "d5c2ca00549910ec251e3bd15f87aeeb206c9456b9a77b43ff6c97c54042a472"
 dependencies = [
  "bstr",
  "doc-comment",
@@ -59,14 +59,13 @@ checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 
 [[package]]
 name = "bstr"
-version = "1.3.0"
+version = "0.2.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5ffdb39cb703212f3c11973452c2861b972f757b021158f3516ba10f2fa8b2c1"
+checksum = "ba3569f383e8f1598449f1a423e72e99569137b47740b1da11ef19af3d5c3223"
 dependencies = [
+ "lazy_static",
  "memchr",
- "once_cell",
  "regex-automata",
- "serde",
 ]
 
 [[package]]
@@ -660,12 +659,6 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
 
-[[package]]
-name = "serde"
-version = "1.0.152"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bb7d1f0d3021d347a83e556fc4683dea2ea09d87bccdf88ff5c12545d89d5efb"
-
 [[package]]
 name = "signal-hook"
 version = "0.3.14"

Cargo.toml

@@ -55,8 +55,9 @@ unicode-width = "0.1.9"
 crossterm = { version = "0.25.0", features = [] }
 
 [dev-dependencies]
+# 2.0.5 is the last version that supports rustc 1.57.
+assert_cmd = "=2.0.5"
 pretty_assertions = "1.2.1"
-assert_cmd = "2.0.8"
 
 [build-dependencies]
 cc = "1.0.78"