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88483bde - Deduplicate the regress, wat/wasmparser and base64 dependencies (#97762)

Deduplicate the regress, wat/wasmparser and base64 dependencies (#97762) ### What? Collapses three duplicated crate dependencies, so each is built once instead of twice. **−150 KiB** of code Manifests and `Cargo.lock` only — no source changes, and none were needed. **`regress` → 0.11.1** (−133 KiB, the bulk of the win) **`wat` and `wasmparser` → the 239 family** (−13 KiB) **`base64` → one workspace declaration on 0.22** (−1.2 KiB)