Merge pull request tensorflow#1892 from gharibian/releng_20210712_163008

Update version for 2.4.2 release.

Merge pull request tensorflow#1889 from jurampark/releng_20210706_221009

Update version for 2.2.3 release.

Merge pull request tensorflow#1884 from nniuzft/releng_20210630_130712

Update version for 2.6.0-rc0 release.

Merge pull request tensorflow#1876 from tensorflow/minglotus-6-patch-1

Use bazel 0.24.1 in r2.1

Merge pull request tensorflow#1861 from netfs/releng_20210513_124441

Update version for 2.5.1 release.

Merge pull request tensorflow#1857 from netfs/releng_20210505_165659

Update version for 2.5.0-rc3 release.

Merge pull request tensorflow#1852 from shadowdragon89/releng_2021042…

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Update version for 2.5.0-rc2 release.

Merge pull request tensorflow#1843 from netfs/releng_20210417_153506

Update version for 2.5.0-rc1 release.

Merge pull request tensorflow#1840 from nniuzft/releng_20210416_104859

Update version for 2.5.0-rc0 release.

Merge pull request tensorflow#1810 from tensorflow/netfs-patch-1

Update .bazelrc