fix(ns-checkmk-utils): sync checkmk-tools v1.7.3 downloads

[Coverup20]

Summary

Sync ns-checkmk-utils with nethesis/checkmk-tools v1.7.3.

This PR supersedes Renovate PR #1773 and includes both:

• the dependency version bump from 0.0.5 to 1.7.3
• the required Makefile inventory/hash updates for the current checkmk-tools layout

Changes

• Update PKG_VERSION from 0.0.5 to 1.7.3.
• Add check_apk_packages.py to the download, prepare, and install sections.
• Remove check_martian_packets.py.
• Remove check_opkg_packages.py.
• Refresh HASH values against nethesis/checkmk-tools v1.7.3.

Validation

• Verified all remaining downloads against nethesis/checkmk-tools v1.7.3.
• All HASH values match.
• git diff --check passes.
• Only packages/ns-checkmk-utils/Makefile is changed.

[Copilot]

Pull request overview

This PR updates the ns-checkmk-utils OpenWrt package to track nethesis/checkmk-tools tag v1.7.3, refreshing the set of downloaded Checkmk local checks and their SHA256 hashes.

Changes:

• Bump PKG_VERSION to 1.7.3 and update NS_CHECKMK_UTILS_BASE_URL-driven downloads accordingly.
• Add check_apk_packages.py to download/prepare/install and remove check_martian_packets.py and check_opkg_packages.py.
• Refresh all HASH values for the remaining scripts.

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