Bump org.embulk:embulk-util-timestamp from 0.3.0 to 0.3.1

Bumps [org.embulk:embulk-util-timestamp](https://github.com/embulk/embulk-util-timestamp) from 0.3.0 to 0.3.1.
- [Commits](embulk/embulk-util-timestamp@v0.3.0...v0.3.1)

---
updated-dependencies:
- dependency-name: org.embulk:embulk-util-timestamp
  dependency-version: 0.3.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -19,7 +19,7 @@ embulk-util-guess = "0.4.0"
 embulk-util-json = "0.5.0"
 embulk-util-text = "0.2.0"
 embulk-util-rubytime = "0.4.0"
-embulk-util-timestamp = "0.3.0"
+embulk-util-timestamp = "0.3.1"
 
 junit4 = "4.13.2"
 embulk-core = "0.11.0"