Fix minor typo

[vipocenka]

This pull request fixes typographical errors in multiple Go files related to HTTP request handlers and documentation. Specifically:

1. Updated "a address" to "an address" in the following functions:

   • SendRequestHandlerFn in bank/client/rest/tx.go
   • TopupHandlerFn in topup/client/rest/tx.go
   • WithdrawFeeHandlerFn in topup/client/rest/tx.go

2. Corrected "a HTTP error" to "an HTTP error" in the WriteErrorResponse function within types/rest/rest.go.

These changes improve the accuracy and professionalism of the codebase.

[cffls]

Thanks! It would be great if you can remove the dependency updates, since they should go to dedicated PRs.

[marcello33]

@vipocenka please remove the deps update so we can proceed with merge.
Thank you

[vipocenka]

@marcello33
I have removed the dependency updates from this PR as requested. Now, it only includes the typographical fixes. Let me know if anything else needs to be adjusted

[marcello33]

@vipocenka there seems to be some conflicts which I tried to resolve but ended up in deps upgrade again
Please make sure to only commit the typos fix. Thank you