Temporarily use bugfix commit

Author: pitrou

cpp/thirdparty/versions.txt

@@ -82,8 +82,8 @@ ARROW_JEMALLOC_BUILD_VERSION=5.3.0
 ARROW_JEMALLOC_BUILD_SHA256_CHECKSUM=2db82d1e7119df3e71b7640219b6dfe84789bc0537983c3b7ac4f7189aecfeaa
 ARROW_LZ4_BUILD_VERSION=v1.10.0
 ARROW_LZ4_BUILD_SHA256_CHECKSUM=537512904744b35e232912055ccf8ec66d768639ff3abe5788d90d792ec5f48b
-ARROW_MIMALLOC_BUILD_VERSION=v3.2.6
-ARROW_MIMALLOC_BUILD_SHA256_CHECKSUM=bd5756fb2e9f5c275b37ce1d530ac1c98baca0bad6818dcda5c83d6139108a97
+ARROW_MIMALLOC_BUILD_VERSION=7f2d847
+ARROW_MIMALLOC_BUILD_SHA256_CHECKSUM=da4a9f74599a068c1cf30d62ebb4a6f848dad5873162fe0e9dccda9e9b7bf754
 ARROW_NLOHMANN_JSON_BUILD_VERSION=v3.12.0
 ARROW_NLOHMANN_JSON_BUILD_SHA256_CHECKSUM=4b92eb0c06d10683f7447ce9406cb97cd4b453be18d7279320f7b2f025c10187
 ARROW_OPENTELEMETRY_BUILD_VERSION=v1.21.0