Bump ext/flecs from `f006bdc` to `83d7468`

[dependabot[bot]]

Bumps ext/flecs from f006bdc to 83d7468.

Commits

• 83d7468 Add missing ecs_rule_var_count function
• 80b88a7 Fix testcases
• f0fa5cc Replace hash function with wyhash
• 0454830 Implement new entity index
• 822fe0b Add legacy visual studio versions to CI
• dc6d697 Fix issue with symmetric relationships and recycled ids
• 8ae2081 Emulate posix atomics for systems that do not have gnu builtins
• See full diff in compare view

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[lithiumtoast]

@dependabot rebase.

[lithiumtoast]

@dependabot rebase

[lithiumtoast]

@dependabot rebase