Update dependency org.kohsuke.stapler:stapler-jelly to v1870

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.kohsuke.stapler:stapler-jelly (source)	1863.vd250086e9885 -> 1870.v48cc46ef5fee

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Release Notes

stapler/stapler (org.kohsuke.stapler:stapler-jelly)

### [`v1870.v48cc46ef5fee`](https://togithub.com/jenkinsci/stapler/releases/tag/1870.v48cc46ef5fee) [Compare Source](https://togithub.com/stapler/stapler/compare/1863.vd250086e9885...1870.v48cc46ef5fee) #### 🚀 New features and improvements - Use Java 7 versions of `GZIPInputStream` and `GZIPOutputStream` ([#​203](https://togithub.com/stapler/stapler/issues/203)) [@​basil](https://togithub.com/basil)

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