update version after branch

[causten]

This should have been done a couple of months ago but changing version of migraphx since we branched rocm5.7 (months ago). Currently migraphx version lists 2.7 for both the 5.7 and Develop branch. I'm moving our version to 2.8 instead of 3.0.

[codecov]

Codecov Report

Merging #2273 (f3455ed) into develop (60b8b09) will not change coverage.
Report is 1 commits behind head on develop.
The diff coverage is n/a.

❗ Current head f3455ed differs from pull request most recent head f0ebd94. Consider uploading reports for the commit f0ebd94 to get more accurate results

@@           Coverage Diff            @@
##           develop    #2273   +/-   ##
========================================
  Coverage    91.50%   91.50%           
========================================
  Files          430      430           
  Lines        16133    16133           
========================================
  Hits         14762    14762           
  Misses        1371     1371           

[migraphx-bot]

Test	Batch	Rate new 726a31	Rate old f3939b	Diff	Compare
torchvision-resnet50	64	2,323.45	2,326.02	-0.11%	✅
torchvision-resnet50_fp16	64	5,355.83	5,358.11	-0.04%	✅
torchvision-densenet121	32	1,847.37	1,848.23	-0.05%	✅
torchvision-densenet121_fp16	32	3,411.56	3,420.57	-0.26%	✅
torchvision-inceptionv3	32	1,295.70	1,295.65	0.00%	✅
torchvision-inceptionv3_fp16	32	2,534.63	2,538.01	-0.13%	✅
cadene-inceptionv4	16	618.96	620.06	-0.18%	✅
cadene-resnext64x4	16	588.40	589.68	-0.22%	✅
slim-mobilenet	64	7,196.05	7,220.02	-0.33%	✅
slim-nasnetalarge	64	236.24	236.64	-0.17%	✅
slim-resnet50v2	64	2,556.84	2,556.96	-0.00%	✅
bert-mrpc-onnx	8	824.70	824.91	-0.03%	✅
bert-mrpc-tf	1	387.19	389.45	-0.58%	✅
pytorch-examples-wlang-gru	1	301.85	294.32	2.56%	✅
pytorch-examples-wlang-lstm	1	316.63	314.41	0.71%	✅
torchvision-resnet50_1	1	548.75	549.59	-0.15%	✅
torchvision-inceptionv3_1	1	306.94	303.23	1.22%	✅
cadene-dpn92_1	1	355.08	356.62	-0.43%	✅
cadene-resnext101_1	1	219.39	220.18	-0.36%	✅
slim-vgg16_1	1	223.99	224.38	-0.17%	✅
slim-mobilenet_1	1	1,510.25	1,514.28	-0.27%	✅
slim-inceptionv4_1	1	220.79	219.17	0.74%	✅
onnx-taau-downsample	1	307.33	306.29	0.34%	✅
dlrm-criteoterabyte	1	21.69	21.70	-0.05%	✅
dlrm-criteoterabyte_fp16	1	40.75	40.75	-0.00%	✅
agentmodel	1	5,763.99	5,861.32	-1.66%	✅
unet_fp16	2	55.16	55.21	-0.08%	✅
resnet50v1_fp16	1	765.60	768.13	-0.33%	✅
bert_base_cased_fp16	64	970.65	971.58	-0.10%	✅
bert_large_uncased_fp16	32	305.11	305.22	-0.04%	✅
bert_large_fp16	1	167.60	166.81	0.47%	✅
distilgpt2_fp16	16	1,351.75	1,353.09	-0.10%	✅

This build is OK for merge ✅

[migraphx-bot]

    :white_check_mark:bert-mrpc-onnx: PASSED: MIGraphX meets tolerance

    :white_check_mark:bert-mrpc-tf: PASSED: MIGraphX meets tolerance

    :white_check_mark:pytorch-examples-wlang-gru: PASSED: MIGraphX meets tolerance

    :white_check_mark:pytorch-examples-wlang-lstm: PASSED: MIGraphX meets tolerance

    :white_check_mark:torchvision-resnet50_1: PASSED: MIGraphX meets tolerance

    :white_check_mark:torchvision-inceptionv3_1: PASSED: MIGraphX meets tolerance

    :white_check_mark:cadene-dpn92_1: PASSED: MIGraphX meets tolerance

    :white_check_mark:cadene-resnext101_1: PASSED: MIGraphX meets tolerance

    :white_check_mark:slim-vgg16_1: PASSED: MIGraphX meets tolerance

    :white_check_mark:slim-mobilenet_1: PASSED: MIGraphX meets tolerance

    :white_check_mark:slim-inceptionv4_1: PASSED: MIGraphX meets tolerance

    :white_check_mark:dlrm-criteoterabyte: PASSED: MIGraphX meets tolerance

    :white_check_mark:agentmodel: PASSED: MIGraphX meets tolerance

    :white_check_mark:unet: PASSED: MIGraphX meets tolerance

    :white_check_mark:resnet50v1: PASSED: MIGraphX meets tolerance

🔴bert_base_cased_fp16: FAILED: MIGraphX is not within tolerance - check verbose output

🔴bert_large_uncased_fp16: FAILED: MIGraphX is not within tolerance - check verbose output

    :white_check_mark:bert_large: PASSED: MIGraphX meets tolerance

🔴distilgpt2_fp16: FAILED: MIGraphX is not within tolerance - check verbose output