Migrate from s3 sdk v2 to v3 (#6731)

* chore: migrate from s3 sdk v2 to v3

* import signature-v4-crt

* downgrade minor version

* Add s3-presigned-post manually

* Change s3 mock

* Update server/storage/files/S3Storage.ts

* docs

* Upgrade aws-sdk

---------

Co-authored-by: Tom Moor <tom.moor@gmail.com>

server/typings/index.d.ts

@@ -19,10 +19,3 @@ declare module "@joplin/turndown-plugin-gfm" {
   export const taskListItems: Plugin;
   export const gfm: Plugin;
 }
-
-declare module "aws-sdk/lib/maintenance_mode_message" {
-  const maintenance: {
-    suppress: boolean;
-  };
-  export default maintenance;
-}