Made github version increment script fully local

[qstokkink]

Fixes #1298

This PR:

• Updates github_increment_version.py to only use git commands.

Full disclosure: I hate this but it seems to be the only way to avoid juggling GitHub access tokens.

Example output:

Title: Automated Version Update
Tag version: 2.14
Release title: IPv8 v2.14.2152 release
Body:
Includes the first 2152 commits (+41 since v2.13) for IPv8, containing:

 - Added methods for task retrieval to `TaskManager`
 - Added ruff/mypy/unittest workflows
 - Added serialization of lists of ints and booleans
 - Added validation tests to GitHub Actions
 - Added workflow for generating code coverage reports
 - Cache libsodium.dll from the main branch
 - Fixed bootstrap with infinite max_peers
 - Fixed coverage job failures
 - Fixed indentation in coverage.yml
 - Fixed pending task error in test_unload_while_contacting_node
 - Fixed relaying to exits
 - Fixed run_all_tests for Mac
 - Updated README.md workflow badge
 - Updated default dll import path to be '.'
 - Updated the Mock DHT provider to inherit from its intended superclass

[qstokkink]

validate