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sql: fix use-after-poison in variable binding

This patch fixes a bug found by the ASAN instrumentation of LuaJIT
allocator [1]. The problem is using `memcpy` beyond the size of the
buffer being copied.

Failing tests:
  - ./test/sql-luatest/gh_10243_varbinary_bound_variable_test.lua

[1]: Issue #10231

Closes #10398

NO_DOC=bugfix
NO_CHANGELOG=bugfix
NO_TEST=rely on existing test (run failing tests with tarantool
build described in [1]).

(cherry picked from commit 1923078b4)

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