fix: drop on the TracingGuard also shutdown the wrapped TracerProvider

[davidB]

FIX #213

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ EDITORCONFIG	editorconfig-checker	1		0	0.01s
✅ REPOSITORY	checkov	yes		no	9.87s
✅ REPOSITORY	dustilock	yes		no	0.0s
✅ REPOSITORY	gitleaks	yes		no	0.63s
✅ REPOSITORY	git_diff	yes		no	0.01s
✅ REPOSITORY	grype	yes		no	10.36s
✅ REPOSITORY	secretlint	yes		no	0.72s
✅ REPOSITORY	syft	yes		no	1.19s
✅ REPOSITORY	trivy-sbom	yes		no	0.07s
✅ REPOSITORY	trufflehog	yes		no	1.58s

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