Bump to upstream version v0.15.6

[mgfritch]

Update upstream version

Bump Dockerfile to upstream version v0.15.6

changed lines [19] of file "/tmp/updatecli/github/mgfritch/image-build-node-feature-discovery/Dockerfile"

v0.15.6

Release published on the 2024-07-10 13:42:46 +0000 UTC at the url https://github.com/kubernetes-sigs/node-feature-discovery/releases/tag/v0.15.6

## What's Changed

Fixes an issue where node labels were temporarily removed on nfd-worker pod restarts.

**Full Changelog**: https://github.com/kubernetes-sigs/node-feature-discovery/compare/v0.15.5...v0.15.6

Bump Makefile to upstream version v0.15.6

1 file(s) updated with "TAG := v0.15.6$$(BUILD_META)": * Makefile

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