go-mod: bump k8s.io/client-go from 0.26.1 to 0.29.4 in /shifter

[dependabot[bot]]

Bumps k8s.io/client-go from 0.26.1 to 0.29.4.

Commits

• 9f00f2c Update dependencies to v0.29.4 tag
• 1e7adee Merge pull request #124172liggitt/automated-cherry-pick-of-#123598
• 0058eee Merge pull request #124180 from MadhavJivrajani/bump-x-net-2023-45288-129
• f0be73d [CVE-2023-45288] .*: bump x/net to v0.23.0
• ca07432 sync: update go.mod
• 403b37f Merge pull request #123763 from liggitt/proto-1.29
• 92199ae [CVE-2024-24786] Bump github.com/golang/protobuf v1.5.4, google.golang.org/pr...
• cc21122 Keep streams from being set up after closeAllStreamReaders is called
• 8636987 Make websocket heartbeat test timing less flaky
• baea19d Merge pull request #122429 from MadhavJivrajani/tools-bump-129
• Additional commits viewable in compare view

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The following labels could not be found: go-mod.