Bump abseil-cpp to 6f9d96a1f41439ac172ee2ef7ccd8edf0e5d068c

[yongtang]

This PR bumps abseil-cpp to 6f9d96a1f41439ac172ee2ef7ccd8edf0e5d068c
to fix the build issue.

See related changes in tensorflow/tensorflow@1c9eeb9

Signed-off-by: Yong Tang yong.tang.github@outlook.com

[oliverhu]

thanks for fixing the build!

[kvignesh1420]

@yongtang this is unrelated to this CL but seems like the flaky centos7 action has been restored due to an improper rebase in #1283. Can you please remove that task as well in this PR?

io/.github/workflows/build.yml

Lines 91 to 105 in e4bde0e

	- name: CentOS 7
	run: |
	if [[ "${EVENT_NAME}" == "push" && "${REPO_NAME}" == "tensorflow/io" ]]; then
	printf '%s\n' "${GCP_CREDS}" >service_account_creds.json
	export BAZEL_OPTIMIZATION="--remote_cache=https://storage.googleapis.com/tensorflow-sigs-io --remote_upload_local_results=true --google_credentials=service_account_creds.json"
	else
	export BAZEL_OPTIMIZATION="--remote_cache=https://storage.googleapis.com/tensorflow-sigs-io --remote_upload_local_results=false"
	fi
	set -x -e
	bash -x -e .github/workflows/build.space.sh
	python3 .github/workflows/build.instruction.py docs/development.md "##### CentOS 7" > source.sh
	cat source.sh
	docker run -i --rm -v $PWD:/v -w /v --net=host \
	-e BAZEL_OPTIMIZATION="${BAZEL_OPTIMIZATION}" \
	centos:7 bash -x -e source.sh

[yongtang]

Thanks @kvignesh1420 . PR has been updated. Please take a look

[kvignesh1420]

Thanks @yongtang