Bump Buildah to v1.24.0

Bumps Buildah to v1.24.0 and adopts the new values for pull:
true, false, never, and always.  The pull-never and pull-always options
for the build command are still usable, but they have been removed from
the man page documentation with this change.

Signed-off-by: tomsweeneyredhat <tsweeney@redhat.com>

vendor/github.com/containers/buildah/imagebuildah/executor.go

@@ -304,9 +304,7 @@ func newExecutor(logger *logrus.Logger, logPrefix string, store storage.Store, o
 					// and value, or just an argument, since they can be
 					// separated by either "=" or whitespace.
 					list := strings.SplitN(arg.Value, "=", 2)
-					if _, stillUnused := exec.unusedArgs[list[0]]; stillUnused {
-						delete(exec.unusedArgs, list[0])
-					}
+					delete(exec.unusedArgs, list[0])
 				}
 			}
 			break