ARROW-12320: [CI] REPO arg missing from conda-cpp-valgrind
ARROW-12320: [CI] REPO arg missing from conda-cpp-valgrind

Closes #9973 from westonpace/bugfix/arrow-12320

Authored-by: Weston Pace <0dd0706858a011bb30a3fd82b71cee4f9094c502@gmail.com>
Signed-off-by: Sutou Kouhei <73218711cdd5d5c30ac66da3cc4d9d9204caf34b@clear-code.com>

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