Update dependency slackhq/nebula to v1.9.4

This MR contains the following updates:

Package	Type	Update	Change
slackhq/nebula	ironbank-github	patch	v1.9.3 -> v1.9.4

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Release Notes

slackhq/nebula (slackhq/nebula)

v1.9.4

Compare Source

Added

• Support UDP dialing with gVisor. (#​1181)

Changed

• Make some Nebula state programmatically available via control object. (#​1188)
• Switch internal representation of IPs to netip, to prepare for IPv6 support in the overlay. (#​1173)
• Minor build and cleanup changes. (#​1171, #​1164, #​1162)
• Various dependency updates. (#​1195, #​1190, #​1174, #​1168, #​1167, #​1161, #​1147, #​1146)

Fixed

• Fix a bug on big endian hosts, like mips. (#​1194)
• Fix a rare panic if a local index collision happens. (#​1191)
• Fix integer wraparound in the calculation of handshake timeouts on 32-bit targets. (#​1185)

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