[GLUTEN-6887][VL] Daily Update Velox Version (2026_09_07)

[GlutenPerfBot]

Upstream Velox's New Commits:

7dec01ab4 by Xiaoxuan, feat(nimble): Add Elias-Fano integer encoding (18875)
64c80cfce by oerling, feat(torchwave): Fill a wide cat's operands in parallel, on either grid (18866)
c5f666da8 by oerling, feat(torchwave): Split a starved step into balanced kernel launches (18865)
d13ef1e30 by oerling, feat(torchwave): Per-column decomposition and chain gather folding (18864)
a1e56fe39 by macduan, perf(nimble): Vectorize the ALP encode transform and grid search
609c32fe5 by macduan, fix(nimble): Harden FSST decoding bounds
dd5d6bbaa by macduan, fix(nimble): Synchronize encoding pool test callback
b46c1741d by oerling, fix(torchwave): Barrier before an elementwise op reads a leaf this kernel wrote (18862)
1f83a4047 by oerling, feat: Fused batch_flip_and_truncate_sparse (18861)
afd946b47 by macduan, fix(nimble): Isolate vendored FSST C++ symbols
646a7a898 by oerling, feat(torchwave): Standalone Triton port of masked_select_jagged and its test (18860)
5ecb2c5ca by oerling, feat(torchwave): Read a .pt2's flat inputs so a 1k-row graph can be tested
7427d6aab by tanjialiang, fix(nimble): Skip stripes that project no streams
1b1566023 by Hongze Zhang, feat(spark): Support toIntermediate in AverageAggregate
61b7be277 by tanjialiang, perf(nimble): Slice BlockBitPacking partial blocks structurally instead of repacking
3769b9ad7 by Pedro Pedreira, feat(vector): Expose if DecodedVector buffers are borrowed or owned (18795)
c10f41ba1 by Wei He, fix(build): Remove deprecated gMock `Invoke` wrappers
e527416d7 by Maria Basmanova, refactor(connectors): Add is<T>() and as<T>() downcasts (18847)
3e9b8f8ff by Maria Basmanova, feat(exec): Show what a table scan reads in plan text (18842)
1cae9c7ea by Sathish Krishna Raju, feat(writer): Expose nimble writer options as SerDe keys
dd436f010 by Kaifei Yi, feat: Add Spark btrim function
796c6214c by zhichenxu-meta, fix(rpc): Guard the backend stats read on close(), and split isBlocked() by mode (18743)
def80f989 by dependabot[bot], build(deps): Bump fast-uri from 3.1.5 to 3.1.7 in /website
990d1c8ba by inf, feat(parquet): Add writer.row-group-size config
d7cec91cd by jkhaliqi, refactor(parquet): Use velox parquet reader in FileSerializeTest
bcf94d0a8 by Wei He, fix(build): Remove deprecated gMock action wrappers
c40c77c78 by Maria Basmanova, fix(build): Drop LazyRE2 from parse_duration
edf4530c4 by tanjialiang, fix(nimble): Reject shared dictionary encoding in the index projector
832171843 by Xiaoxuan, fix(nimble): Bound parallel decode across reader tree (18828)
d6f31488a by Ping Liu, fix(parquet): Use unaligned loads in DeltaBpDecoder SIMD path
1a170973d by kevinwilfong, fix(exec): Only retain clustered input when no group spans batches (18789)

velox_branch: https://github.com/IBM/velox/commits/dft-2026_09_07

Related issue: #6887