security/pleaser: update to 0.4.2

-Fix example
-Check should fail if handed a non-regular file
-Document control characters
-Optional environment passthrough
-Removing superfluous backtick
-Child should be handled in parent
-Removing redundant util.rs
-Reorganising tests to storage overheads
-Clippy suggestions
-Removing need to drop privs in child
-Forking can be done as low priv user

(pin)