ARROW-10857: [Packaging] Follow PowerTools repository name change on CentOS 8

Closes #8871 from kou/packaging-centos-8-powertools

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>

Author: kou

dev/release/verify-yum.sh

@@ -46,7 +46,7 @@ have_flight=yes
 have_gandiva=yes
 have_glib=yes
 have_parquet=yes
-install_command="dnf install -y --enablerepo=PowerTools"
+install_command="dnf install -y --enablerepo=powertools"
 case "${distribution}-${distribution_version}" in
   centos-7)
     cmake_pakcage=cmake3

dev/tasks/linux-packages/apache-arrow-release/yum/centos-8/Dockerfile

@@ -22,7 +22,7 @@ ARG DEBUG
 RUN \
   quiet=$([ "${DEBUG}" = "yes" ] || echo "--quiet") && \
   dnf install -y ${quiet} epel-release && \
-  dnf install --enablerepo=PowerTools -y ${quiet} \
+  dnf install --enablerepo=powertools -y ${quiet} \
     rpm-build \
     rpmdevtools && \
   dnf clean ${quiet} all

dev/tasks/linux-packages/apache-arrow/yum/centos-8/Dockerfile

@@ -25,7 +25,7 @@ ARG DEBUG
 RUN \
   quiet=$([ "${DEBUG}" = "yes" ] || echo "--quiet") && \
   dnf install -y ${quiet} epel-release && \
-  dnf install --enablerepo=PowerTools -y ${quiet} \
+  dnf install --enablerepo=powertools -y ${quiet} \
     bison \
     boost-devel \
     brotli-devel \