ci: build qs2/stringfish from source (RcppParallel 6.2.0 oneTBB ABI break)

[seonghobae]

The check job fails during dependency setup while building SimDesign:

unable to load shared object '.../stringfish/libs/stringfish.so':
undefined symbol: _ZN3tbb8internal25concurrent_vector_base_v316internal_grow_byEmmPFvPvPKvmES4_

Root cause: RcppParallel 6.2.0 migrated to oneTBB and dropped the legacy tbb::internal symbols. The cached/prebuilt stringfish (and qs2) binaries still link those symbols, so anything loading them under the freshly built RcppParallel 6.2.0 fails. Pre-existing repo-wide breakage, unrelated to PR diffs (seen on #209, job 91893493500).

Fix: force stringfish=?source and qs2=?source in setup-r-dependencies and bump cache-version to 2 to discard poisoned caches. Same fix as ContextualWisdomLab/kaefa#76, where the previously failing macOS/Windows release jobs already went green. Revert once CRAN/PPM rebuild binaries against RcppParallel 6.2.0.

Unblocks #209 and every other open aFIPC PR.

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