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

@@ -15,7 +15,7 @@ jackson = "2.16.2"
 
 embulk-util-file = "0.1.5"
 embulk-util-json = "0.5.0"
-embulk-util-timestamp = "0.3.0"
+embulk-util-timestamp = "0.3.1"
 
 checkstyle = "9.3"