Remove fixing cncf.kubernetes provider when generating constraints

When we yanked cncf.kubernetes provider, we pinned 3.1.2
temporarily for provider generation. This removes the pinning as
we are already at 4.0.2 version

scripts/in_container/_in_container_utils.sh

@@ -326,10 +326,8 @@ function install_all_providers_from_pypi_with_eager_upgrade() {
     # Installing it with Airflow makes sure that the version of package that matches current
     # Airflow requirements will be used.
     # shellcheck disable=SC2086
-    # NOTE! Until we unyank the cncf.kubernetes provider, we explicitly install yanked 3.1.2 version
-    # TODO:(potiuk) REMOVE IT WHEN provider is released
     pip install -e ".[${NO_PROVIDERS_EXTRAS}]" "${packages_to_install[@]}" ${EAGER_UPGRADE_ADDITIONAL_REQUIREMENTS} \
-        --upgrade --upgrade-strategy eager apache-airflow-providers-cncf-kubernetes==3.1.2
+        --upgrade --upgrade-strategy eager
 
 }