fix: client/Dockerfile to reduce vulnerabilities (#2220)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-ALPINE318-BUSYBOX-7249236
- https://snyk.io/vuln/SNYK-ALPINE318-BUSYBOX-7249236
- https://snyk.io/vuln/SNYK-ALPINE318-BUSYBOX-7249265
- https://snyk.io/vuln/SNYK-ALPINE318-BUSYBOX-7249265
- https://snyk.io/vuln/SNYK-ALPINE318-BUSYBOX-7249419

Co-authored-by: snyk-bot <snyk-bot@snyk.io>