chore(release): 2.8.1

[chaoming0625]

Release 2.8.1.

• Bumps brainpy/_version.py to 2.8.1.
• Adds the 2.8.1 changelog.md entry.

Included since 2.8.0

• fix(brainpy): repair 18 correctness bugs found in a full-package audit #868 — audited 18-bug, library-wide correctness sweep (dnn, integrators, encoders, initializers, connectivity, optimizers, dynold STP, offline/online training, object transforms, runners), each with a regression test.
• fix(ci): repair adaptive pooling ZeroDivisionError and mypy numpy stubs #867 — adaptive-pooling ZeroDivisionError on up-sampling + numpy typing stubs.
• fix(build): read version statically from brainpy._version #866 / refactor: move __version__ and __version_info__ into _version.py #865 — static/relocated version metadata in brainpy._version.
• Refresh docs notebooks; fix clear_buffer/pmap runtime bugs; drive package-wide mypy to zero #863 — docs-notebook refresh, clear_buffer/pmap fixes, package-wide mypy to zero.
• fix(dyn): PoissonGroup never spikes due to boolean rand_like dtype #862 — PoissonGroup spiking regression.
• chore(ci)(deps): bump codecov/codecov-action from 5 to 7 #861 — codecov action bump.

Cuts the v2.8.1 GitHub release.

Summary by Sourcery

Prepare the 2.8.1 patch release with updated version metadata and detailed changelog entry focused on correctness improvements and tooling updates.

Bug Fixes:

• Document audited, library-wide correctness fixes across dnn, integrators, encoders, initializers, connectivity, optimizers, synaptic plasticity, training algorithms, object transforms, and runners.
• Document fixes for adaptive pooling ZeroDivisionError, PoissonGroup spiking regression, STDP update keyword typo, DSRunner deprecation warning, and clear_buffer/pmap runtime bugs.

Enhancements:

• Summarize the introduction of numpy typing stubs and refreshed documentation notebooks in the changelog.

Build:

• Document static version metadata in brainpy._version and build-time version reading, plus the bump of codecov/codecov-action.

Documentation:

• Add a detailed changelog section for version 2.8.1 including release date, scope of correctness sweep, and categorized bug fixes.

[sourcery-ai]

Reviewer's Guide

Patch release 2.8.1: bump the library version and add a comprehensive changelog section summarizing the audited correctness sweep (#868), related bug fixes, and tooling/build updates.

Flow diagram for the 2.8.1 release metadata update

flowchart TD
  A[Update brainpy_version_to_2_8_1_in_brainpy__version_py]
  B[Add_version_2_8_1_entry_to_changelog_md]
  C[Cut_v2_8_1_GitHub_release]

  A --> B --> C

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File-Level Changes

Change	Details	Files
Document release 2.8.1 details and correctness-focused fixes in the changelog.	Add a new 2.8.1 section with release date and high-level overview emphasizing the audited bug-fix sweep. List detailed bug-fix subsections covering normalization/encoding, integrators, initializers, connectivity, optimizers, training algorithms/runners, object transforms, and synaptic plasticity. Record other fixes including adaptive pooling, PoissonGroup spiking, STDP update keyword correction, DSRunner deprecation warning, and docs/runtime tweaks. Summarize build/tooling updates: mypy cleanup, static version metadata, and codecov action bump.	changelog.md
Update package version metadata for the 2.8.1 release.	Increment version string from 2.8.0 to 2.8.1. Ensure version_info remains derived from the updated version value.	brainpy/_version.py

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