Update dependency slackhq/nebula to v1.9.5

This MR contains the following updates:

Package	Type	Update	Change
slackhq/nebula	ironbank-github	patch	v1.9.4 -> v1.9.5

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Release Notes

slackhq/nebula (slackhq/nebula)

v1.9.5

Compare Source

Added

• Gracefully ignore v2 certificates. (#​1282)

Fixed

• Fix relays that refuse to re-establish after one of the remote tunnel pairs breaks. (#​1277)

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