bump version to 0.8.1 for pg-walstream and dependencies

[isdaniel]

as title

[codspeed-hq]

Merging this PR will degrade performance by 13.59%

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

❌ 4 regressed benchmarks
✅ 46 untouched benchmarks

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
❌	zero_copy_bytes[1024]	370.8 ns	429.2 ns	-13.59%
❌	zero_copy_bytes[256]	370.8 ns	429.2 ns	-13.59%
❌	zero_copy_bytes[4096]	370.8 ns	429.2 ns	-13.59%
❌	zero_copy_bytes[64]	370.8 ns	429.2 ns	-13.59%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

---

_{Comparing rel/v0.8.1 (ae4c374) with main (cca0144)}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.76%. Comparing base (cca0144) to head (ae4c374).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #108   +/-   ##
=======================================
  Coverage   94.76%   94.76%           
=======================================
  Files          27       27           
  Lines       20678    20678           
=======================================
  Hits        19596    19596           
  Misses       1082     1082           

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