bump Rust Driver to 1.6.0 + later panic fix

[wprzytula]

CI tests are failing due to a panic in the Rust Driver, which was fixed in scylla-rust-driver/pull/1644, after 1.6.0 was released. This PR updates the driver to commit
e04a12a9950cb3d051288541d5439835098c5cc2 (the newest commit on Rust Driver's main branch), which should fix the CI tests.

Cargo.lock's changes were performed by running:

cargo update -p scylla-cql -p scylla-proxy -p scylla --manifest-path=scylla-rust-wrapper/Cargo.toml

Pre-review checklist

• I have split my patch into logically separate commits.
• All commit messages clearly explain what they change and why.
• PR description sums up the changes and reasons why they should be introduced.
• [ ] I have implemented Rust unit tests for the features/changes introduced.
• [ ] I have enabled appropriate tests in Makefile in {SCYLLA,CASSANDRA}_(NO_VALGRIND_)TEST_FILTER.
• [ ] I added appropriate Fixes: annotations to PR description.

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📝 Walkthrough

Walkthrough

Pins Scylla Rust dependencies to commit e04a12a9950cb3d051288541d5439835098c5cc2 and updates an integration test to include cassandra.h and use CASS_CONSISTENCY_ALL for validation queries.

Changes

Dependency Revision Updates

Layer / File(s)	Summary
Scylla crate revisions update scylla-rust-wrapper/Cargo.toml	scylla, scylla-proxy, and scylla-cql dependencies updated from v1.5.0 tags to git revision e04a12a9950cb3d051288541d5439835098c5cc2.

Integration test change

Layer / File(s)	Summary
test_async include and consistency tests/src/integration/tests/test_async.cpp	Adds #include "cassandra.h" and changes the validation session_.execute call to include CASS_CONSISTENCY_ALL. Also asserts that awaited Future returns CASS_OK.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

I hopped through Cargo.toml tonight,
Three crates aligned under one commit light,
A header added, consistency set to all,
Tests and crates answer the rabbit's call,
Small changes stitched — a tidy flight. 🐰

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: updating the Rust Driver to version 1.6.0 and including a panic fix, which aligns with the changeset updating Cargo.toml dependencies.
Description check	✅ Passed	The PR description includes context for the changes, explains why they are needed (CI test failures due to a panic fix), documents how Cargo.lock was updated, and addresses the pre-review checklist with appropriate markings.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[Copilot]

Pull request overview

This PR updates the scylla-rust-wrapper crate to use a newer upstream scylla-rust-driver commit (post-1.6.0) intended to fix a CI-failing panic, and refreshes the lockfile accordingly.

Changes:

• Pin scylla, scylla-cql, and scylla-proxy git dependencies to commit e04a12a9950cb3d051288541d5439835098c5cc2.
• Update Cargo.lock to reflect the new scylla* crate versions (1.6.0 / 0.0.6) and updated transitive dependencies.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
scylla-rust-wrapper/Cargo.toml	Pins Scylla Rust driver-related git dependencies to the specified upstream commit to pick up the panic fix.
scylla-rust-wrapper/Cargo.lock	Lockfile refresh to match the updated driver commit and its transitive dependency graph.

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[wprzytula]

Rebased on master, with the fix #463.

[wprzytula]

Force pushed just to trigger the checks, which (no idea why) didn't fire before.