fix: mention "3" as a valid value for "resolver" field in error message

Author: yamgent

src/cargo/core/resolver/types.rs

@@ -122,7 +122,7 @@ impl ResolveBehavior {
             "2" => Ok(ResolveBehavior::V2),
             "3" => Ok(ResolveBehavior::V3),
             s => anyhow::bail!(
-                "`resolver` setting `{}` is not valid, valid options are \"1\" or \"2\"",
+                "`resolver` setting `{}` is not valid, valid options are \"1\", \"2\" or \"3\"",
                 s
             ),
         }

tests/testsuite/features2.rs

@@ -1391,7 +1391,7 @@ fn resolver_bad_setting() {
 [ERROR] failed to parse manifest at `[ROOT]/foo/Cargo.toml`
 
 Caused by:
-  `resolver` setting `foo` is not valid, valid options are "1" or "2"
+  `resolver` setting `foo` is not valid, valid options are "1", "2" or "3"
 
 "#]])
         .run();