chore: set version to v1.4.0

Author: github-actions[bot]

CHANGELOG.md

@@ -0,0 +1,16 @@
+### What's changed in v1.4.0
+
+* chore(deps): update unbounded-tech/workflow-vnext-tag action to v1.21.3 (#12) (by @renovate[bot])
+
+  Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
+
+* chore(deps): update unbounded-tech/workflow-simple-release action to v2.1.3 (#11) (by @renovate[bot])
+
+  Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
+
+* feat(deps): update crossplane-contrib/function-auto-ready docker tag to v0.7.0 (#15) (by @renovate[bot])
+
+  Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
+
+
+See full diff: [v1.3.0...v1.4.0](https://github.com/hops-ops/knative-stack/compare/v1.3.0...v1.4.0)