chore: removing obsolete / deprecated EoL .Net 3.1, 5.0, 6.0 #627

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Status	Duration	Name
🟢 Succeeded	9 seconds	init
🟢 Succeeded	13 seconds	clone-repository
🟢 Succeeded	2 minutes	build-container
🟢 Succeeded	6 seconds	build-image-index
🟢 Succeeded	19 seconds	ecosystem-cert-preflight-checks
🟢 Succeeded	13 seconds	sast-unicode-check
🟢 Succeeded	10 seconds	rpms-signature-scan
🟢 Succeeded	11 seconds	sast-snyk-check
🟢 Succeeded	43 seconds	clamav-scan
🟢 Succeeded	13 seconds	sast-shell-check
🟢 Succeeded	6 seconds	coverity-availability-check
🟢 Succeeded	6 seconds	apply-tags
🟢 Succeeded	43 seconds	clair-scan
🟢 Succeeded	8 seconds	deprecated-base-image-check
🟢 Succeeded	11 seconds	push-dockerfile
🟢 Succeeded	7 seconds	show-summary
🟢 Succeeded	6 seconds	show-sbom