Bump checkstyle from 8.37 to 8.38 (line#594)

Bumps [checkstyle](https://github.com/checkstyle/checkstyle) from 8.37 to 8.38.
- [Release notes](https://github.com/checkstyle/checkstyle/releases)
- [Commits](checkstyle/checkstyle@checkstyle-8.37...checkstyle-8.38)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

NON-ISSUE Support RedeliveryRecipient. (line#577)

Video viewing complete event has been added line#560 (line#570)

* Add missing duration field in VideoMessageContent class.
Close line#568

* Use Integer type to consistency with AudioMessageContent.

* fix javadoc

* Support videoPlayComplete event.

* resolve conflict

Bump spotbugs-gradle-plugin from 4.4.5 to 4.5.0 (line#559)

Bumps spotbugs-gradle-plugin from 4.4.5 to 4.5.0.

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Merge pull request line#555 from line/dependabot/gradle/org.springfra…

…mework.boot-spring-boot-gradle-plugin-2.3.2.RELEASE

Bump spring-boot-gradle-plugin from 2.3.1.RELEASE to 2.3.2.RELEASE

Merge pull request line#508 from kazuki-ma/channelTokenV2

Support Channel access token v2.1

Merge pull request line#491 from ta7uw/issue-306

Change type of URL field to `URI`

Merge pull request line#483 from kazuki-ma/kazuki-ma/issue-440

Add label field to ImageMap.

Release 3.3.1

Merge pull request line#431 from line/kazuki-ma/line-bot-parser

NON-ISSUE setup :line-bot-parser:uploadArchives