Fix Windows cp1252 encoding bugs in build_all_github.py

[Wewoc]

Summary

The first real build-release.yml run (v1.7.3.3, test pre-release) actually succeeded end-to-end — build, tests, and all 4 release assets uploaded — but surfaced two bugs, both rooted in Windows' default console/subprocess encoding being cp1252, not UTF-8 (build_all.py's own _Tee already works around this class of issue for its own output; build_all_github.py didn't):

1. git log -1 --pretty=%B was decoded with the subprocess default (cp1252) instead of UTF-8, mangling non-ASCII characters (em-dashes → —) in the commit-message-derived release notes — the real v1.7.3.3 release body shipped with garbled text. Fixed with encoding="utf-8" on the subprocess.run() call.
2. The final success print() (uses a ✓) crashed with UnicodeEncodeError after build_all.main() had already restored the real stdout/stderr — cosmetic (Release + assets were already published by that point) but made a fully successful run report red. Fixed by reconfiguring stdout/stderr to UTF-8 with errors="replace" at module load.

v1.7.3.3's garbled pre-release was deleted manually; this fix is for the next real run.

Test plan

• python -m py_compile passes
• Next workflow_dispatch run produces a clean, correctly-encoded release body and a green job

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• src/compiler/build_all_github.py

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