Widen omop-alchemy and oa-configurator pins to semver ranges

[nicoloesch]

• Closes Relax omop-alchemy / oa-configurator pins to semver ranges #51.

Now that #39 put both this repo and its upstream packages on label-driven semver, replaces exact pins with >=current,<next-major ranges:

• omop-alchemy==0.8.0 -> >=0.8.0,<1.0.0
• oa-configurator==0.1.2 -> >=0.1.2,<1.0.0

Also aligns the dev extra's oa-configurator[postgres] floor (previously >=0.1.1, now >=0.1.2,<1.0.0) with the main dependency constraint, and installs the cava-devops pre-commit hook so future dependency edits keep uv.lock surgically in sync without relying on memory:

chmod +x .githooks/pre-commit
git config core.hooksPath .githooks

Notes

CI on this PR will fail until cava-devops PR AustralianCancerDataNetwork/cava-devops#2 merges to main

• ci.yml here already points at @main for the --frozen-based build-test-postgres.yml, which doesn't exist there yet. This is expected and will resolve on its own once that PR merges; no action needed here beyond waiting.