[Snyk] Security upgrade certifi from 2019.11.28 to 2023.7.22

[secgitopscore]

Snyk has created this PR to fix 1 vulnerabilities in the pip dependencies of this project.

Snyk changed the following file(s):

• docs/samples/custom/kfserving-custom-model/requirements.txt

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[//]: # 'snyk:metadata:{"customTemplate":{"variablesUsed":[],"fieldsUsed":[]},"dependencies":[{"name":"certifi","from":"2019.11.28","to":"2023.7.22"}],"env":"prod","issuesToFix":[{"exploit_maturity":"No Known Exploit","id":"SNYK-PYTHON-CERTIFI-5805047","priority_score":704,"priority_score_factors":[{"type":"fixability","label":true,"score":214},{"type":"cvssScore","label":"9.8","score":490},{"type":"scoreVersion","label":"v1","score":1}],"severity":"critical","title":"Improper Following of a Certificate's Chain of Trust"}],"prId":"0707413d-6aaf-43b5-ba67-12b495c9b507","prPublicId":"0707413d-6aaf-43b5-ba67-12b495c9b507","packageManager":"pip","priorityScoreList":[704],"projectPublicId":"52b7289d-0467-4d7f-87a0-8dc9053471a4","projectUrl":"https://app.snyk.io/org/coreweave-engineering/project/52b7289d-0467-4d7f-87a0-8dc9053471a4?utm_source=github-enterprise&utm_medium=referral&page=fix-pr","prType":"backlog","templateFieldSources":{"branchName":"default","commitMessage":"default","description":"default","title":"default"},"templateVariants":["pkg-based-remediation","updated-fix-title","priorityScore"],"type":"auto","upgrade":[],"vulns":["SNYK-PYTHON-CERTIFI-5805047"],"patch":[],"isBreakingChange":false,"remediationStrategy":"dependency"}'