Update dependency rugged to v1.9.0

This MR contains the following updates:

Package	Update	Change	MyDiffEnd
rugged	minor	1.6.3 -> 1.9.0	https://my.diffend.io/gems/rugged/1.6.3/1.9.0

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Release Notes

libgit2/rugged (rugged)

v1.9.0

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v1.7.2

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v1.7.1

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v1.6.5

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