[Snyk] Security upgrade alpine from latest to 3.18.3

[mattcobb]

This PR was automatically created by Snyk using the credentials of a real user.

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Changes included in this PR

• go/opentracing/client/Dockerfile

We recommend upgrading to alpine:3.18.3, as this image has only 0 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Some of the most important vulnerabilities in your base image include:

Severity	Issue	Exploit Maturity
	Improper Authentication SNYK-ALPINE318-OPENSSL-5776808	No Known Exploit
	Improper Authentication SNYK-ALPINE318-OPENSSL-5776808	No Known Exploit
	Inefficient Regular Expression Complexity SNYK-ALPINE318-OPENSSL-5788370	No Known Exploit
	Inefficient Regular Expression Complexity SNYK-ALPINE318-OPENSSL-5788370	No Known Exploit
	CVE-2023-3817 SNYK-ALPINE318-OPENSSL-5821142	No Known Exploit

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🦉 Inefficient Regular Expression Complexity

[nslaughter]

Have raised this for consideration by Python SDK maintainers and internal OpenTelemetry PM. Considering whether the right move is to continue maintenance of the replacement examples from legacy OpenTracing or to focus resources on urging updates and deprecate this entirely.