tsconfig.json generated by jsii has compilerOptions 'Charset'

[abinash453]

tsconfig.json auto generated by jsii has "charset": "utf8" in "compilerOptions". But Option 'charset' is deprecated as per https://www.typescriptlang.org/tsconfig#charset

also during jest testing, this gives error:
error TS5101: Option 'charset' is deprecated and will stop functioning in TypeScript 5.5. Specify compilerOption '"ignoreDeprecations": "5.0"' to silence this error.