chore(deps): bump github.com/slack-go/slack from 0.15.0 to 0.16.0 (#3122)

Bumps [github.com/slack-go/slack](https://github.com/slack-go/slack) from 0.15.0 to 0.16.0.
- [Release notes](https://github.com/slack-go/slack/releases)
- [Changelog](https://github.com/slack-go/slack/blob/master/history.go)
- [Commits](slack-go/slack@v0.15.0...v0.16.0)

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

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

Author: dependabot[bot]

go.mod

@@ -38,7 +38,7 @@ require (
 	github.com/mitchellh/mapstructure v1.5.0
 	github.com/muesli/reflow v0.3.0
 	github.com/oapi-codegen/runtime v1.1.1
-	github.com/slack-go/slack v0.15.0
+	github.com/slack-go/slack v0.16.0
 	github.com/spf13/afero v1.12.0
 	github.com/spf13/cobra v1.8.1
 	github.com/spf13/pflag v1.0.6

go.sum

@@ -886,8 +886,8 @@ github.com/sivchari/tenv v1.12.1 h1:+E0QzjktdnExv/wwsnnyk4oqZBUfuh89YMQT1cyuvSY=
 github.com/sivchari/tenv v1.12.1/go.mod h1:1LjSOUCc25snIr5n3DtGGrENhX3LuWefcplwVGC24mw=
 github.com/skeema/knownhosts v1.3.0 h1:AM+y0rI04VksttfwjkSTNQorvGqmwATnvnAHpSgc0LY=
 github.com/skeema/knownhosts v1.3.0/go.mod h1:sPINvnADmT/qYH1kfv+ePMmOBTH6Tbl7b5LvTDjFK7M=
-github.com/slack-go/slack v0.15.0 h1:LE2lj2y9vqqiOf+qIIy0GvEoxgF1N5yLGZffmEZykt0=
-github.com/slack-go/slack v0.15.0/go.mod h1:hlGi5oXA+Gt+yWTPP0plCdRKmjsDxecdHxYQdlMQKOw=
+github.com/slack-go/slack v0.16.0 h1:khp/WCFv+Hb/B/AJaAwvcxKun0hM6grN0bUZ8xG60P8=
+github.com/slack-go/slack v0.16.0/go.mod h1:hlGi5oXA+Gt+yWTPP0plCdRKmjsDxecdHxYQdlMQKOw=
 github.com/sonatard/noctx v0.1.0 h1:JjqOc2WN16ISWAjAk8M5ej0RfExEXtkEyExl2hLW+OM=
 github.com/sonatard/noctx v0.1.0/go.mod h1:0RvBxqY8D4j9cTTTWE8ylt2vqj2EPI8fHmrxHdsaZ2c=
 github.com/sourcegraph/conc v0.3.0 h1:OQTbbt6P72L20UqAkXXuLOj79LfEanQ+YQFNpLA9ySo=