[Snyk] Security upgrade golang from 1.13.0-alpine to 1.20.3-alpine

[snyk-bot]

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

• examples/redeploy-instead-of-hot-reload/Dockerfile

We recommend upgrading to golang:1.20.3-alpine, 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	Priority Score / 1000	Issue	Exploit Maturity
	400	Out-of-bounds Read SNYK-ALPINE310-APKTOOLS-1246341	No Known Exploit
	500	Out-of-bounds Read SNYK-ALPINE310-APKTOOLS-1534688	No Known Exploit
	400	Improper Handling of Exceptional Conditions SNYK-ALPINE310-BUSYBOX-1090151	No Known Exploit
	400	Improper Handling of Exceptional Conditions SNYK-ALPINE310-BUSYBOX-1090151	No Known Exploit
	400	Integer Overflow or Wraparound SNYK-ALPINE310-OPENSSL-1075741	No Known Exploit

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