relax dep versions

[inoas]

No description provided.

[Copilot]

Pull request overview

Updates project tooling and dependency constraints to support newer Gleam/Erlang versions and relax supported dependency ranges, while refreshing the generated Gleam manifest lockfile.

Changes:

• Relax dependency version ranges for cake and gleam_stdlib, and regenerate manifest.toml with newer resolved versions.
• Bump project version to 1.4.0, update minimum Gleam version, and add changelog entry.
• Add a Docker Compose file for local Postgres testing and update CI/tooling versions.

Reviewed changes

Copilot reviewed 5 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
manifest.toml	Regenerated lockfile with newer resolved transitive dependency versions and updated requirement ranges.
gleam.toml	Bumps package version, raises minimum Gleam version, relaxes dependency constraints, and adds LICENCE to docs pages.
compose.yml	Adds local Postgres service definition for running tests/development against Postgres.
CHANGELOG.md	Adds 1.4.0 release entry noting dependency updates.
.tool-versions	Updates pinned Erlang/Gleam tool versions for local development.
.github/workflows/test.yml	Updates Gleam versions used in CI matrix calls.
.github/workflows/abstract_test.yml	Updates default Gleam/Erlang versions for reusable CI workflow.

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