Bump omnibus-software from `28a9db0` to `dada23e` in /omnibus

[dependabot-preview[bot]]

Bumps omnibus-software from 28a9db0 to dada23e.

Commits

• dada23e Merge pull request #1263 from chef/git
• d1486bb Merge pull request #1264 from chef/libffi
• fd8718f Merge pull request #1262 from chef/omnibus8
• 819d219 Update the default libffi to 3.3
• a2f68ce Update git to 2.29.2 and remove old versions
• c114e1e Require omnibus 8 or later
• ff47ef1 Merge pull request #1261 from chef/omnibus6
• d48c1c5 Eliminate the nexus? check
• 43a3c5a Convert version helpers to platform_version checks
• cb7cfa4 Remove ios_xr support
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Superseded by #3065.