[8.x] [Chore][OAS] Remove use of `any` in generator lib uti…

…lity (#192440) (#192823)

# Backport

This will backport the following commits from `main` to `8.x`:
- [[Chore][OAS] Remove use of `any` in generator lib utility
(#192440)](#192440)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT [{"author":{"name":"Jean-Louis
Leysens","email":"[email protected]"},"sourceCommit":{"committedDate":"2024-09-13T09:08:21Z","message":"[Chore][OAS]
Remove use of `any` in generator lib utility (#192440)\n\n##
Summary\r\n\r\nTiny change, using a cast to `Record` instead of relying
on
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Remove use of `any` in generator lib
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Remove use of `any` in generator lib utility (#192440)\n\n##
Summary\r\n\r\nTiny change, using a cast to `Record` instead of relying
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Remove use of `any` in generator lib utility (#192440)\n\n##
Summary\r\n\r\nTiny change, using a cast to `Record` instead of relying
on
`any`.","sha":"9c18dfad14b684968263977e27bb59a989444aa1"}},{"branch":"8.x","label":"v8.16.0","branchLabelMappingKey":"^v8.16.0$","isSourceBranch":false,"state":"NOT_CREATED"}]}]
BACKPORT-->

Co-authored-by: Jean-Louis Leysens <[email protected]>

packages/kbn-router-to-openapispec/src/oas_converter/kbn_config_schema/post_process_mutations/mutations/utils.ts

@@ -43,8 +43,8 @@ export const processDiscontinued = (schema: OpenAPIV3.SchemaObject): void => {
 };
 
 /** Just for type convenience */
-export const deleteField = (schema: Record<any, unknown>, field: string): void => {
-  delete schema[field];
+export const deleteField = (schema: object, field: string): void => {
+  delete (schema as Record<string, unknown>)[field];
 };
 
 export const isAnyType = (schema: OpenAPIV3.SchemaObject): boolean => {