Update node version for integration tests

[cffls]

This commit made a few changes:

1. Upgrade cardano-node version to v8.x.x from v1.x.x. This will help with testing when entering Chang hardfork.
2. Upgrade ogmios to 6.x.x because of change 1.
3. Replace built-in ogmios chain context with https://gitlab.com/viperscience/ogmios-python because of change 2.
4. Temporarily disable Kupo in integration test because ogmios-python doesn't support kupo yet.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 83.61%. Comparing base (486d97f) to head (386191a).

Files	Patch %	Lines
pycardano/backend/cardano_cli.py	66.66%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #345 +/- ## ========================================== - Coverage 83.62% 83.61% -0.02% ========================================== Files 29 29 Lines 3719 3722 +3 Branches 936 939 +3 ========================================== + Hits 3110 3112 +2 Misses 445 445 - Partials 164 165 +1 ```

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