fix: missing explicit `ethers` import

[freemanzMrojo]

Description

For the index.js bundle there was an issue because an explicit import of ethers 6 was missing.

Tested with the veworld-mobile repo and it works.

Closes #1506.

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

With the SDK test suite.

Besides that, I have modified the import at the veworld-mobile repo so package.json looks like this (I have both projects at the same level):

    "@vechain/sdk-core": "file:../vechain-sdk-js/packages/core",
    "@vechain/sdk-network": "file:../vechain-sdk-js/packages/network",

After this, just run:

1. yarn install:all
2. yarn test

All tests are passing for me.

Test Configuration:

• Node.js Version: 20.18.0
• Yarn Version: 1.22.19

Checklist:

• [x] My code follows the coding standards of this project
• [x] I have performed a self-review of my code
• [x] I have commented on my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] New and existing integration tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules
• [x] I have not added any vulnerable dependencies to my code

[github-actions[bot]]

Test Coverage

Summary

Lines	Statements	Branches	Functions
	98.99% (4343/4387)	97.53% (1387/1422)	99% (896/905)

Title	Tests	Skipped	Failures	Errors	Time
core	827	0 :zzz:	0 :x:	0 :fire:	2m 21s :stopwatch:
network	719	0 :zzz:	0 :x:	0 :fire:	5m 7s :stopwatch:
errors	42	0 :zzz:	0 :x:	0 :fire:	17.019s :stopwatch:
logging	3	0 :zzz:	0 :x:	0 :fire:	18.394s :stopwatch:
hardhat-plugin	19	0 :zzz:	0 :x:	0 :fire:	59.553s :stopwatch:
aws-kms-adapter	23	0 :zzz:	0 :x:	0 :fire:	1m 30s :stopwatch:
ethers-adapter	5	0 :zzz:	0 :x:	0 :fire:	1m 12s :stopwatch:
rpc-proxy	37	0 :zzz:	0 :x:	0 :fire:	1m 3s :stopwatch:

[leszek-vechain]

is there any way we can add a test for it on our side ? before it goes to external clients like veworld ?

[freemanzMrojo]

is there any way we can add a test for it on our side ? before it goes to external clients like veworld ?

The closest I am aware of is what I did locally and described above.