set solo's default gaslimit to 40M

[libotony]

Description

Fixes vechain/protocol-board-repo#179

Type of change

Please delete options that are not relevant.

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

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• [x] Start bin/thor solo and curl http://localhost:8669/blocks/1 check the gaslimit

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my code
• [x] I have commented 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 E2E 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

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 61.25%. Comparing base (2284a66) to head (6e75e50).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #720 +/- ## ========================================== + Coverage 61.24% 61.25% +0.01% ========================================== Files 194 194 Lines 18207 18207 ========================================== + Hits 11150 11152 +2 + Misses 5975 5973 -2 Partials 1082 1082 ```

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