[SPARK-35869][INFRA] Fix "Cannot run program python" error from do-re…

…lease-docker.sh

### What changes were proposed in this pull request?

Add `python-is-python3` to `create-release/spark-rm/Dockerfile`

### Why are the changes needed?

Systems that use pthon3 by default should explicitly indicate the python version is 3.

### Does this PR introduce _any_ user-facing change?

No.

### How was this patch tested?

Tested during Apache 3.0.3 release.

Closes #33048 from Ngone51/fix-release-script.

Authored-by: yi.wu <yi.wu@databricks.com>
Signed-off-by: Hyukjin Kwon <gurwls223@apache.org>

dev/create-release/spark-rm/Dockerfile

@@ -70,7 +70,7 @@ RUN apt-get clean && apt-get update && $APT_INSTALL gnupg ca-certificates && \
   curl -sL https://deb.nodesource.com/setup_12.x | bash && \
   $APT_INSTALL nodejs && \
   # Install needed python packages. Use pip for installing packages (for consistency).
-  $APT_INSTALL python3-pip python3-setuptools && \
+  $APT_INSTALL python-is-python3 python3-pip python3-setuptools && \
   # qpdf is required for CRAN checks to pass.
   $APT_INSTALL qpdf jq && \
   pip3 install $PIP_PKGS && \