Bump github.com/mailgun/mailgun-go/v4 from 4.20.0 to 4.20.5

Bumps [github.com/mailgun/mailgun-go/v4](https://github.com/mailgun/mailgun-go) from 4.20.0 to 4.20.5.
- [Release notes](https://github.com/mailgun/mailgun-go/releases)
- [Changelog](https://github.com/mailgun/mailgun-go/blob/master/CHANGELOG)
- [Commits](mailgun/mailgun-go@v4.20.0...v4.20.5)

---
updated-dependencies:
- dependency-name: github.com/mailgun/mailgun-go/v4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

go.mod

@@ -6,7 +6,7 @@ require (
 	github.com/emersion/go-smtp v0.21.3
 	github.com/go-ozzo/ozzo-validation/v4 v4.3.0
 	github.com/kelseyhightower/envconfig v1.4.0
-	github.com/mailgun/mailgun-go/v4 v4.20.0
+	github.com/mailgun/mailgun-go/v4 v4.20.5
 	github.com/pkg/errors v0.9.1
 	github.com/prometheus/client_golang v1.20.5
 	github.com/sirupsen/logrus v1.9.3

go.sum

@@ -33,8 +33,8 @@ github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0
 github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
 github.com/mailgun/errors v0.4.0 h1:6LFBvod6VIW83CMIOT9sYNp28TCX0NejFPP4dSX++i8=
 github.com/mailgun/errors v0.4.0/go.mod h1:xGBaaKdEdQT0/FhwvoXv4oBaqqmVZz9P1XEnvD/onc0=
-github.com/mailgun/mailgun-go/v4 v4.20.0 h1:vEFKT082sKfmrKPdmY2fWbYIhSL64vwY7l6g83RIUHU=
-github.com/mailgun/mailgun-go/v4 v4.20.0/go.mod h1:768NjUvsxW8Ga8fHIPITmr5f/U8qmnQqnZ3/cs3StUc=
+github.com/mailgun/mailgun-go/v4 v4.20.5 h1:X0n0faLwHy8iQmCVrzOmJAwsAEGjvtcCu38patBUfbc=
+github.com/mailgun/mailgun-go/v4 v4.20.5/go.mod h1:768NjUvsxW8Ga8fHIPITmr5f/U8qmnQqnZ3/cs3StUc=
 github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
 github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd h1:TRLaZ9cD/w8PVh93nsPXa1VrQ6jlwL5oN8l14QlcNfg=
 github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=