Use 1.8.1 for ONNX 1.8.1 final release (onnx#3249)

* cherry-pick 2ee79a6

Signed-off-by: Chun-Wei Chen <[email protected]>

* cherry-pick 5e8bc2c

Signed-off-by: Chun-Wei Chen <[email protected]>

* version bump 1.8.1 and remove python 2.7

Signed-off-by: Chun-Wei Chen <[email protected]>

* use 1.8.0.1 to test package

Signed-off-by: Chun-Wei Chen <[email protected]>

Co-authored-by: Ashwini Khade <[email protected]>

use 1.8.0 for the final Release (onnx#3098)

Signed-off-by: Chun-Wei Chen <[email protected]>

Change version number for release 1.7.0 (onnx#2768)

The release candidate 1.7.105 passed verification. Now
we need to reset version number back to 1.7.0 in the
release branch for the official release.

Incrementing version number to 1.6.0 (onnx#2353)

* Incrementing version number to 1.6.0

* Updating ML version to 2

Bump up version number and update Versioning for 1.5.0 release

Bump up version for a patch release (onnx#1766)

* Bump up version number for v1.4.0 (onnx#1761) (onnx#1763)

* Bump up version to 1.4.1

Bump up version number for v1.4.0 (onnx#1761)

Bump up version for 1.2.3; Avoid copying non-existing files (onnx#1394)

minor fix to scan documentation (onnx#1355)

Add missing warning ignoring flags to onnx_proto CMake target (onnx#1105

)