feat(whale-api): whitelist gettxout (#2186)

<!--  Thanks for sending a pull request! -->

#### What this PR does / why we need it:

#### Which issue(s) does this PR fixes?:
<!--
(Optional) Automatically closes linked issue when PR is merged.
Usage: `Fixes #<issue number>`, or `Fixes (paste link of issue)`.
-->
Fixes #

#### Additional comments?:

.github/workflows/ci.yml

@@ -52,6 +52,8 @@ jobs:
       - uses: codecov/codecov-action@eaaf4bedf32dbdc6b720b63067d99c4d77d6047d # v3.1.4
         with:
           fail_ci_if_error: true
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
 
   docker-sanity:
     needs: [ build, lint ]

apps/whale-api/src/module.api/rpc.controller.ts

@@ -43,7 +43,8 @@ export class MethodWhitelist implements PipeTransform {
     'getgovproposal',
     'listgovproposals',
     'listgovproposalvotes',
-    'vmmap'
+    'vmmap',
+    'gettxout'
   ]
 
   transform (value: string, metadata: ArgumentMetadata): string {