Update Golang module github.com/heimdalr/dag

[updateclibot]

Update Golang module github.com/heimdalr/dag

Bump github.com/heimdalr/dag to v1.4.0

go.mod updated Module path "github.com/heimdalr/dag" version from "v1.3.1" to "v1.4.0"

v1.4.0

Changelog retrieved from:
	https://github.com/heimdalr/dag/releases/tag/v1.4.0
## What's Changed
* implement `OrderedWalk`: Walk in Topological Order by @Nearoo in https://github.com/heimdalr/dag/pull/30

## New Contributors
* @Nearoo made their first contribution in https://github.com/heimdalr/dag/pull/30

**Full Changelog**: https://github.com/heimdalr/dag/compare/v1.3.0...v1.4.0

Run Go mod tidy

ran shell command "go mod tidy"

GitHub Action workflow link

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