Chore: advance the pypto-lib submodule to b48da63

[ndleslx]

Advances the pypto-lib submodule from 2cd5f828 to
b48da63
(21 commits):

Perf

• b48da63 align DeepSeek V4 CSA indexer scoring with baseline (#1030)
• 9ba79cf retune dspark SWA decode task partitioning (#1028)
• df3e8a6 fuse DeepSeek V4 decode O projection reduce-scatter (#998)
• baec009 accelerate DeepSeek-V4 Flash token generation (#1014)
• b3b9c44 replace DSpark greedy_sample sort with a vector max scan (#1005)

Add

• 1d7c701 1M context support for DeepSeek V4 CSA decode (#1013)
• efd5848 dspark prompt prefill and variable decode context (#999)
• c7f700c dspark context-parallel prefill SWA, HCA and CSA (#1010)
• b9b60da 1M context in DeepSeek V4 HCA decode (#1008)
• 665665a dspark context-parallel prefill KV all-gather (#1006)

Refactor

• 4be3f5e drop the MTP hc_pre syncall implementation and restyle (#1029)
• cb43e09 defer DeepSeek V4 MTP communication waits (#1024)
• 634e77b rename enable_l2_swimlane to enable_chip_swimlane (#1012)
• b7accac resolve pto-isa from the pin, not PTO_ISA_ROOT (#1011)
• 193819b inline the dspark decode output entries and route by --tp (#1003)

Fix / CI / Docs

• 017cb44 cap nanobind below 3.0 in the CI setup (#1018)
• ab4ecb1 unpin pypto and resolve the toolchain from HEAD again (#1002) —
  already mirrored on this side by Revert "CI: pin the pypto revision instead of tracking its HEAD" #178
• 5d32927 / dd69c60 / bbc4093 Qwen3-14B optimization, DeepSeek V4 decode
  optimization, and distributed programming guides

The range moves the DeepSeek V4 / MTP / dspark paths this repo's guards
exercise — notably the MTP hc_pre syncall removal and comm-wait deferral, close
to the area #144 touched before its revert (#186). The Qwen3 and DeepSeek V4
accuracy guards run on this PR unchanged and are the gate for the bump.

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