Update dependency pydiscourse to >=1.6,<1.7

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
pydiscourse	>=1.5,<1.6 -> >=1.6,<1.7

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Release Notes

bennylope/pydiscourse (pydiscourse)

### [`v1.6.1`](https://togithub.com/bennylope/pydiscourse/blob/HEAD/HISTORY.rst#161) [Compare Source](https://togithub.com/bennylope/pydiscourse/compare/v1.6.0...v1.6.1) - Adds `posts_by_number` endpoint from [@​Dettorer](https://togithub.com/Dettorer) ### [`v1.6.0`](https://togithub.com/bennylope/pydiscourse/blob/HEAD/HISTORY.rst#160) [Compare Source](https://togithub.com/bennylope/pydiscourse/compare/v1.5.0...v1.6.0) - Breaking: `toggle_gravatar`, `pick_avatar`, `create_group` now *require* keyword arguments where keyword arguments were used. This *may* break existing code if you have not referenced these by keyword! - Introduced `ruff` and `black` into pre-commit hook - Added `lint` job to GitHub Actions, tests will run if and only if lint job passes. - Sundry code cleanup

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Configuration

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[github-actions[bot]]

Test coverage for eae6d55f07f929dc5ae759abb037af7f2a6ff0f4

Name                      Stmts   Miss Branch BrPart  Cover   Missing
---------------------------------------------------------------------
src/__init__.py              71      0     28      0   100%
src/action.py               154      0     46      0   100%
src/check.py                 53      0     21      0   100%
src/clients.py               12      0      0      0   100%
src/commit.py                42      0     12      0   100%
src/constants.py              9      0      0      0   100%
src/content.py               50      0     10      0   100%
src/discourse.py            156      0     34      0   100%
src/docs_directory.py        33      0      8      0   100%
src/download.py              23      0      2      0   100%
src/exceptions.py            15      0      0      0   100%
src/index.py                128      0     48      0   100%
src/metadata.py              28      0     12      0   100%
src/migration.py             87      0     27      0   100%
src/navigation_table.py      65      0     20      0   100%
src/reconcile.py             87      0     38      0   100%
src/repository.py           282      0     88      0   100%
src/sort.py                  39      0     22      0   100%
src/types_.py               147      0     22      0   100%
---------------------------------------------------------------------
TOTAL                      1481      0    438      0   100%

Static code analysis report

Working... ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 100% 0:00:02
Run started:2023-09-05 08:00:53.596627

Test results:
    No issues identified.

Code scanned:
    Total lines of code: 15447
    Total lines skipped (#nosec): 14
    Total potential issues skipped due to specifically being disabled (e.g., #nosec BXXX): 0

Run metrics:
    Total issues (by severity):
        Undefined: 0
        Low: 0
        Medium: 0
        High: 0
    Total issues (by confidence):
        Undefined: 0
        Low: 0
        Medium: 0
        High: 0
Files skipped (0):