Update dependency vapor/leaf to from: "4.5.1"

[renovate]

This PR contains the following updates:

Package	Update	Change
vapor/leaf	patch	from: "4.5.0" -> from: "4.5.1"

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Release Notes

vapor/leaf (vapor/leaf)

v4.5.1: - Refactor encoder property to weak reference in KeyedContainerImpl and UnkeyedContainerImpl to prevent retain cycles

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What's Changed

Refactor encoder property to weak reference in KeyedContainerImpl and UnkeyedContainerImpl to prevent retain cycles by @​makoni in #​239

I’ve noticed memory usage growth in my project that is described in vapor/leaf#238

After adding some tests and running leaks, I found that currently there are retain cycles. That PR fixes them.

  4 (352 bytes) ROOT CYCLE: <EncoderImpl 0x1572270d0> [80]
     3 (272 bytes) storage --> ROOT CYCLE: <Leaf.LeafEncoder.(KeyedContainerImpl in _30C79F4310B915184892E56903FC555A)<CodingKeys in Foo #&#8203;1 in closure #&#8203;1 (Vapor.Application) async throws -> () in LeafTests.LeafMemoryGrowthTests.testRepeatedRenderMemoryGrowth() async throws -> ()> 0x157227120> [48]
        __strong encoder --> CYCLE BACK TO <EncoderImpl 0x1572270d0> [80]
        2 (224 bytes) __strong data._variant --> <Swift._DictionaryStorage<Swift.String, Leaf.(LeafEncodingResolvable in _30C79F4310B915184892E56903FC555A)> 0x157227170> [192]  item count: 1
           1 (32 bytes) <Closure context 0x157227150> [32]

  2 (128 bytes) ROOT CYCLE: <EncoderImpl 0x156710ad0> [80]
     1 (48 bytes) storage --> ROOT …

…

This patch was released by @​gwynne

Full Changelog: vapor/leaf@4.5.0...4.5.1

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