update parse arg (#396)

* Revert "Cargo.toml: don't accept semver-compatible with parse_arg 0.1.4 (#381)"

This reverts commit c3ac35b.

* update parse-arg to 0.1.6

Author: pchickey

Cargo.lock

@@ -86,7 +86,7 @@ log = "0.4.21"
 oci-distribution = "0.11"
 owo-colors = "4.0.0"
 p256 = "0.13.2"
-parse_arg = "=0.1.4"
+parse_arg = "0.1.6"
 predicates = "3.1.0"
 pretty_env_logger = "0.5.0"
 rand_core = "0.6.4"