Address comment: use python-is-python3 package for bullseye builder

sonic-slave-bullseye/Dockerfile.j2

@@ -352,7 +352,9 @@ RUN apt-get update && apt-get install -y \
         pkg-config \
 # For audisp-tacplus
         libauparse-dev \
-        auditd
+        auditd \
+# For bazel build
+        python3-is-python
 
 RUN apt-get -y build-dep openssh
 
@@ -524,6 +526,4 @@ LABEL "com.azure.dev.pipelines.agent.handler.node.path"="/usr/bin/node"
 {%- if CONFIGURED_ARCH == "amd64" or CONFIGURED_ARCH == "arm64" %}
 ARG bazelisk_url=https://github.com/bazelbuild/bazelisk/releases/latest/download/bazelisk-linux-{{ CONFIGURED_ARCH }}
 RUN curl -fsSL -o /usr/local/bin/bazel ${bazelisk_url} && chmod 755 /usr/local/bin/bazel
-# Bazel depends on "python" command, but python3 is okay
-RUN ln -s /usr/bin/python3 /usr/bin/python
 {% endif -%}