Bump js-yaml from 3.12.0 to 3.15.1 in /samples/client/petstore/typescript-angularjs - #18

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• ❓  /language:actions
• ❓  /language:csharp
• ❓  /language:java-kotlin
• ❓  /language:javascript-typescript
• ❓  /language:ruby
• ❓  /language:rust

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