Bump version to v6

Cargo.lock

@@ -564,7 +564,7 @@ dependencies = [
 
 [[package]]
 name = "rustlings"
-version = "5.6.1"
+version = "6.0.0"
 dependencies = [
  "anyhow",
  "assert_cmd",
@@ -585,7 +585,7 @@ dependencies = [
 
 [[package]]
 name = "rustlings-macros"
-version = "5.6.1"
+version = "6.0.0"
 dependencies = [
  "quote",
 ]

Cargo.toml

@@ -2,7 +2,7 @@
 resolver = "2"
 
 [workspace.package]
-version = "5.6.1"
+version = "6.0.0"
 authors = [
   "Liv <mokou@fastmail.com>",
   "Carol (Nichols || Goulding) <carol.nichols@gmail.com>",