Fix minor version exact match

[fantix]

The following cases will now use exact minor version match:

• edgedb server info --version
• edgedb server install --version
• edgedb instance upgrade --to-version
• edgedb project init --server-version
• edgedb project init with version in edgedb.toml
• edgedb porject init with interactively-collected version
• edgedb project upgrade --to-version (--force to downgrade)
• edgedb project upgrade with new version in edgedb.toml

Fixes #687