Automatic merge from submit-queue (batch tested with PRs 64445, 67459, 67434). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

updated fluentd to 1.2.4

**What this PR does / why we need it**: 
* updates fluentd in fluentd-elasticsearch to version 1.2.4
* also updates activesupport, fluent-plugin-elasticsearch & oj gems

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
* updates fluentd in fluentd-elasticsearch to version 1.2.4
* also updates activesupport, fluent-plugin-elasticsearch & oj gems
```