Change load factor of concur. set from 0.5 to 0.75 (#15007)

Before, the 50% load factor was not working correctly with the new capacity
calculation on resize and too many resizes were seen.

Before this change
------------------

Example:

old_capacity = 32
old_size = 16
deleted_entries = 2 (almost all live)

That means we have:
expected_size = 14
We'll see that 64 > 14 * 4

We'll end up using 32 as the new capacity (same as old) even though that only
leaves us two elements free before we'd have to rebuild again.

Co-authored-by: John Hawthorn <john.hawthorn@shopify.com>

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