ARROW-9819: [C++] Bump mimalloc to 1.6.4
ARROW-9819: [C++] Bump mimalloc to 1.6.4

1.6.4 includes a fix for https://github.com/microsoft/mimalloc/issues/277, which we need to enable it in the R Windows CRAN packages.

Closes #8019 from nealrichardson/mimalloc-1.6.4

Authored-by: Neal Richardson <beb59f0141269d2d04e73d0dcc1967b64ba87e13@gmail.com>
Signed-off-by: Sutou Kouhei <73218711cdd5d5c30ac66da3cc4d9d9204caf34b@clear-code.com>

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