feat(deps): bump github.com/slack-go/slack from 0.10.2 to 0.10.3

Bumps [github.com/slack-go/slack](https://github.com/slack-go/slack) from 0.10.2 to 0.10.3.
- [Release notes](https://github.com/slack-go/slack/releases)
- [Changelog](https://github.com/slack-go/slack/blob/master/CHANGELOG.md)
- [Commits](slack-go/slack@v0.10.2...v0.10.3)

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

Signed-off-by: dependabot[bot] <support@github.com>

go.mod

@@ -29,7 +29,7 @@ require (
 	github.com/muesli/coral v1.0.0
 	github.com/muesli/mango-coral v1.0.1
 	github.com/muesli/roff v0.1.0
-	github.com/slack-go/slack v0.10.2
+	github.com/slack-go/slack v0.10.3
 	github.com/stretchr/testify v1.7.1
 	github.com/ulikunitz/xz v0.5.10
 	github.com/xanzy/go-gitlab v0.64.0

go.sum

@@ -619,8 +619,8 @@ github.com/sirupsen/logrus v1.2.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPx
 github.com/sirupsen/logrus v1.4.1/go.mod h1:ni0Sbl8bgC9z8RoU9G6nDWqqs/fq4eDPysMBDgk/93Q=
 github.com/sirupsen/logrus v1.7.0 h1:ShrD1U9pZB12TX0cVy0DtePoCH97K8EtX+mg7ZARUtM=
 github.com/sirupsen/logrus v1.7.0/go.mod h1:yWOB1SBYBC5VeMP7gHvWumXLIWorT60ONWic61uBYv0=
-github.com/slack-go/slack v0.10.2 h1:KMN/h2sgUninHXvQI8PrR/PHBUuWp2NPvz2Kr66tki4=
-github.com/slack-go/slack v0.10.2/go.mod h1:5FLdBRv7VW/d9EBxx/eEktOptWygbA9K2QK/KW7ds1s=
+github.com/slack-go/slack v0.10.3 h1:kKYwlKY73AfSrtAk9UHWCXXfitudkDztNI9GYBviLxw=
+github.com/slack-go/slack v0.10.3/go.mod h1:hlGi5oXA+Gt+yWTPP0plCdRKmjsDxecdHxYQdlMQKOw=
 github.com/smartystreets/assertions v0.0.0-20180927180507-b2de0cb4f26d/go.mod h1:OnSkiWE9lh6wB0YB77sQom3nweQdgAjqCqsofrRNTgc=
 github.com/smartystreets/assertions v1.0.0/go.mod h1:kHHU4qYBaI3q23Pp3VPrmWhuIUrLW/7eUrw0BU5VaoM=
 github.com/smartystreets/go-aws-auth v0.0.0-20180515143844-0c1422d1fdb9/go.mod h1:SnhjPscd9TpLiy1LpzGSKh3bXCfxxXuqd9xmQJy3slM=