Multiple fixes

[bogdanfazakas]

Fixes # .

Changes proposed in this PR:

• set higher min gas fee for sepolia test network to avoid the underpriced tx issues (faced multiple times inside the insights app)
• fixed integration tests
• upgrade node version from 16 to node 20
• update ci files to use newer versions of node
• added more details for a tx send if that tx fails

[jamiehewitt15]

Is there any particular reason the tests are failing?

[bogdanfazakas]

Is there any particular reason the tests are failing?

there is a problem with the repo tests that I'm trying to fix atm, not related to the PR but would be nice to fix them before we have a new lib release

[codeclimate]

Code Climate has analyzed commit 1218aba and detected 3 issues on this pull request.

Here's the issue category breakdown:

Category	Count
Complexity	1
Duplication	2

The test coverage on the diff in this pull request is 80.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 75.5%.

View more on Code Climate.