Bump deps/coqutil from `b3e96d7` to `691dce4`

[dependabot[bot]]

Bumps deps/coqutil from b3e96d7 to 691dce4.

Commits

• 691dce4 expose_exists_for_letexists hook
• See full diff in compare view

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[JasonGross]

@dependabot recreate

[dependabot[bot]]

Sorry, only users with push access can use that command.

[dependabot[bot]]

Superseded by #378.