feat: add biopython 1.87 to scientific-slim runenv

[PaulNewling]

Summary

• Adds biopython==1.87 to python-3.12.10-scientific-slim/config.json.
• Updates the variant description to reflect the new dependency.
• Adds a minor changeset for @platforma-open/milaboratories.runenv-python-3.12.10-scientific-slim.

Why

The sequence-properties block currently bundles biopython per-block via pip + requirements.txt. Promoting biopython into the shared scientific-slim runenv lets that block (and future ones) drop the per-block bundle and pull biopython from the shared environment instead.

biopython==1.87 matches the version already pinned in blocks/sequence-properties/software/uv.lock.

Notes

• No version bump in package.json — changesets handle that on merge.
• No checker/whitelists/python-3.12.10-scientific-slim/ added. Builder treats a missing whitelist as non-fatal (builder/src/build.ts:478-482); biopython 1.87 on cpython 3.12 has a small native footprint and is expected to import cleanly across all five platforms. If CI flags an import on some platform, the checker emits a snippet to copy in.
• Block-side switch (sequence-properties → scientific-slim) is a follow-up PR after this publishes.

[gemini-code-assist]

Code Review

This pull request adds biopython version 1.87 to the scientific-slim Python 3.12.10 run environment. The changes include updating the dependency list in config.json, the package description in package.json, and adding a changeset file to document the minor version update. I have no feedback to provide.