chore(drivers): move bundled pin to f4ab266e

[frahlg]

Change

• Move the bundled-driver pin to device-drivers@f4ab266e84e16f202deb468ce5198dfcadaa33df.
• Bring in version bumps for CTEK API v1 and v2 (0.3.2) and Sungrow (1.5.8).
• Keep telemetry, control, and register code unchanged across all 37 bundled drivers.
• Add a patch changeset.

Checks

• scripts/sync-bundled-drivers.sh --behind
• make driver-versions-across-pin DRIVER_BASE=origin/master
• make driver-repository-validate
• go test ./internal/drivers/... ./internal/driverinventory/... ./internal/driverrepo/...
• make verify
• pre-push make verify-all

Fixes #862

[frahlg]

Merge check for head 924159b248abf069353e1f421f76d6fa746f0bd4:

• The PR changes only drivers/BUNDLED_SOURCE.json and one patch changeset. No open PR touches either file.
• Comparing the old and new pins shows only version-line changes in bundled Lua files: CTEK API v1 and v2 move to 0.3.2; Sungrow moves to 1.5.8. Telemetry, control, and register code does not change.
• GitHub passes core, full stack, Device Support contract, changeset, policy, and final go test + vet checks.
• Local checks also pass pin freshness, versions across the pin, publication of all 37 unsigned recovery drivers, the driver Go packages, make verify, and pre-push make verify-all.

The workflow's path classifier currently counts drivers/BUNDLED_SOURCE.json as core before it can count it as drivers, so the two driver-named CI jobs show as skipped. Core fetches this exact pin and tests it. I did not change test.yml here because open PRs #735, #736, and #785 already touch that file.

/drivers/ is owned by @frahlg; this PR is also authored by @frahlg, so GitHub cannot record a self-approval. There are no review comments or open threads.