[ImgBot] Optimize images

*Total -- 570.37kb -> 512.18kb (10.2%)

/src/upgrade-compatibility-tool/img/mvp-diagram-v3.png -- 83.95kb -> 55.25kb (34.19%)
/src/upgrade-compatibility-tool/img/upgrade-compatibility-tool-development.png -- 110.29kb -> 83.97kb (23.86%)
/src/upgrade-compatibility-tool/img/audience-uct-v2.png -- 376.13kb -> 372.95kb (0.84%)

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