Update ambassador requirement from 0.2.1 to 0.3.5

[dependabot[bot]]

Updates the requirements on ambassador to permit the latest version.

Commits

• a6703fe Switched to version 0.3.5
• 6a8ecc7 Merge pull request #44 from dewert99/master
• 4a5fa0a Added support for GATs
• 088ec47 Merge pull request #43 from dewert99/master
• 2fe8b16 Fixed failing test to be up-to-date with stable
• e4a0465 Allow single variant enums
• 7aa8160 Reverted readme change
• fce2d6e Switched to version 0.3.4
• b202a5e Merge pull request #40 from dewert99/master
• d699f26 Error reporting improvements
• Additional commits viewable in compare view

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[strohel]

@dependabot rebase