Update submodule to latest master in microsoft/main

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Upstream commits included in this update

• 76d509e948 math/rand/v2: document PCG and ChaCha8 tradeoffs
• 63b51fc270 runtime: lock M for the entire fast path
• fe4da8e5c5 runtime: unify mallocStub fast/slow blocks
• 28279274c8 go/types, types2: improve error message for incomplete alias hashing
• 3aeef4896d os: test and fix ReadDir("/dev/fd") on macOS
• 5703e108de cmd/internal/objfile: use 'B' code for ELF and PE BSS symbols
• 48bf92284c cmd/compile, simd/archsimd: make Wasm Get/SetElem work for out-of-bound constants
• 0f0fb7add0 simd/archsimd: rename arm64 test files
• b350da230f simd/archsimd: deduplicate simd_test.go and arm64_simd_test.go
• e233bce82f simd/archsimd: deduplicate ternary test helpers
• 649897800b runtime: handle nil pointer in sysFreeOS on sbrk platforms
• 104f868a02 cmd/link: quote PE .def library name
• 29c1c946aa runtime: deconflict gscan and mutex profiler
• cdf96936c0 simd/archsimd: deduplicate conversion test helpers

View full diff on GitHub

[review-bot-for-go]

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[qmuntal]

Ported the TestExternalLinkerCgoExec fix upstream: https://go-review.googlesource.com/c/go/+/795640.