Bump github.com/samber/slog-multi from 1.3.3 to 1.4.0 (#21)

Bumps [github.com/samber/slog-multi](https://github.com/samber/slog-multi) from 1.3.3 to 1.4.0.
- [Release notes](https://github.com/samber/slog-multi/releases)
- [Commits](samber/slog-multi@v1.3.3...v1.4.0)

---
updated-dependencies:
- dependency-name: github.com/samber/slog-multi
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

go.mod

@@ -2,7 +2,7 @@ module github.com/samber/slog-formatter
 
 go 1.21
 
-require github.com/samber/slog-multi v1.3.3
+require github.com/samber/slog-multi v1.4.0
 
 require (
 	github.com/samber/lo v1.49.1

go.sum

@@ -10,8 +10,8 @@ github.com/samber/lo v1.49.1 h1:4BIFyVfuQSEpluc7Fua+j1NolZHiEHEpaSEKdsH0tew=
 github.com/samber/lo v1.49.1/go.mod h1:dO6KHFzUKXgP8LDhU0oI8d2hekjXnGOu0DB8Jecxd6o=
 github.com/samber/slog-mock v0.1.0 h1:I3PApMma8+qoxrfh/MoTmHAWTN8CZyrOKAn1FXus7zU=
 github.com/samber/slog-mock v0.1.0/go.mod h1:muKl65H9go1idsAoiDnetK/8pIQY/1X760/UwGD+REI=
-github.com/samber/slog-multi v1.3.3 h1:qhFXaYdW73FIWLt8SrXMXfPwY58NpluzKDwRdPvhWWY=
-github.com/samber/slog-multi v1.3.3/go.mod h1:ACuZ5B6heK57TfMVkVknN2UZHoFfjCwRxR0Q2OXKHlo=
+github.com/samber/slog-multi v1.4.0 h1:pwlPMIE7PrbTHQyKWDU+RIoxP1+HKTNOujk3/kdkbdg=
+github.com/samber/slog-multi v1.4.0/go.mod h1:FsQ4Uv2L+E/8TZt+/BVgYZ1LoDWCbfCU21wVIoMMrO8=
 github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
 github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=