Update sbt-release to 1.0.13

[scala-steward]

Updates com.github.gseitz:sbt-release from 1.0.12 to 1.0.13.
Release Notes/Changelog

I'll automatically update this PR to resolve conflicts as long as you don't change it yourself.

If you'd like to skip this version, you can just close this PR. If you have any feedback, just mention me in the comments below.

Have a fantastic day writing Scala!

Ignore future updates

Add this to your .scala-steward.conf file to ignore future updates of this dependency:

updates.ignore = [ { groupId = "com.github.gseitz", artifactId = "sbt-release" } ]

labels: sbt-plugin-update, semver-patch

[coveralls]

Pull Request Test Coverage Report for Build 55

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 70.0%

---

Totals
Change from base Build 54:	0.0%
Covered Lines:	21
Relevant Lines:	30

---

💛 - Coveralls