Bump github.com/elastic/elastic-package from 0.14.4 to 0.15.0 (#1516)

Bumps [github.com/elastic/elastic-package](https://github.com/elastic/elastic-package) from 0.14.4 to 0.15.0.
- [Release notes](https://github.com/elastic/elastic-package/releases)
- [Changelog](https://github.com/elastic/elastic-package/blob/master/.goreleaser.yml)
- [Commits](elastic/elastic-package@v0.14.4...v0.15.0)

---
updated-dependencies:
- dependency-name: github.com/elastic/elastic-package
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

go.mod

@@ -4,7 +4,7 @@ go 1.16
 
 require (
 	github.com/blang/semver v3.5.1+incompatible
-	github.com/elastic/elastic-package v0.14.4
+	github.com/elastic/elastic-package v0.15.0
 	github.com/elastic/package-registry v0.21.0
 	github.com/magefile/mage v1.11.0
 	github.com/pkg/errors v0.9.1