Use `p2panda-rs` `0.8.0`

[sandreae]

API updates required for bumping p2panda-rs to version 0.8.0

📋 Checklist

• [x] Add tests that cover your changes
• [x] Add this PR to the Unreleased section in CHANGELOG.md
• [x] Link this PR to any issues it closes
• [x] New files contain a SPDX license header

[codecov[bot]]

Codecov Report

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

Comparison is base (4809fab) 92.67% compared to head (37ba66d) 92.68%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #585 +/- ## ======================================= Coverage 92.67% 92.68% ======================================= Files 106 106 Lines 18384 18377 -7 ======================================= - Hits 17037 17032 -5 + Misses 1347 1345 -2 ``` | [Files](https://app.codecov.io/gh/p2panda/aquadoggo/pull/585?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=p2panda) | Coverage Δ | | |---|---|---| | [aquadoggo/src/db/stores/document.rs](https://app.codecov.io/gh/p2panda/aquadoggo/pull/585?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=p2panda#diff-YXF1YWRvZ2dvL3NyYy9kYi9zdG9yZXMvZG9jdW1lbnQucnM=) | `98.85% <100.00%> (-0.01%)` | :arrow_down: | | [aquadoggo/src/db/stores/operation.rs](https://app.codecov.io/gh/p2panda/aquadoggo/pull/585?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=p2panda#diff-YXF1YWRvZ2dvL3NyYy9kYi9zdG9yZXMvb3BlcmF0aW9uLnJz) | `89.74% <100.00%> (+0.11%)` | :arrow_up: | | [aquadoggo/src/materializer/tasks/reduce.rs](https://app.codecov.io/gh/p2panda/aquadoggo/pull/585?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=p2panda#diff-YXF1YWRvZ2dvL3NyYy9tYXRlcmlhbGl6ZXIvdGFza3MvcmVkdWNlLnJz) | `94.84% <100.00%> (-0.09%)` | :arrow_down: | | [aquadoggo/src/test\_utils/node.rs](https://app.codecov.io/gh/p2panda/aquadoggo/pull/585?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=p2panda#diff-YXF1YWRvZ2dvL3NyYy90ZXN0X3V0aWxzL25vZGUucnM=) | `95.00% <100.00%> (ø)` | | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/p2panda/aquadoggo/pull/585/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=p2panda)

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