chore(deps): bump github.com/containrrr/shoutrrr from 0.7.1 to 0.8.0

Bumps [github.com/containrrr/shoutrrr](https://github.com/containrrr/shoutrrr) from 0.7.1 to 0.8.0.
- [Release notes](https://github.com/containrrr/shoutrrr/releases)
- [Changelog](https://github.com/containrrr/shoutrrr/blob/main/goreleaser.yml)
- [Commits](https://github.com/containrrr/shoutrrr/compare/v0.7.1...v0.8.0)

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

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

go.mod

@@ -3,7 +3,7 @@ module github.com/containrrr/watchtower
 go 1.18
 
 require (
-	github.com/containrrr/shoutrrr v0.7.1
+	github.com/containrrr/shoutrrr v0.8.0
 	github.com/docker/cli v24.0.5+incompatible
 	github.com/docker/distribution v2.8.2+incompatible
 	github.com/docker/docker v24.0.5+incompatible
@@ -28,7 +28,7 @@ require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/docker/docker-credential-helpers v0.6.1 // indirect
 	github.com/docker/go-units v0.4.0 // indirect
-	github.com/fatih/color v1.13.0 // indirect
+	github.com/fatih/color v1.15.0 // indirect
 	github.com/fsnotify/fsnotify v1.6.0 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
 	github.com/golang/protobuf v1.5.3 // indirect
@@ -37,7 +37,7 @@ require (
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/magiconair/properties v1.8.7 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
-	github.com/mattn/go-isatty v0.0.16 // indirect
+	github.com/mattn/go-isatty v0.0.17 // indirect
 	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
 	github.com/mitchellh/mapstructure v1.5.0 // indirect
 	github.com/moby/term v0.0.0-20210619224110-3f7ff695adc6 // indirect