Update Rust crate axum-prometheus to 0.7.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
axum-prometheus	dependencies	minor	0.6.1 -> 0.7.0

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Release Notes

Ptrskay3/axum-prometheus (axum-prometheus)

### [`v0.7.0`](https://togithub.com/Ptrskay3/axum-prometheus/blob/HEAD/CHANGELOG.md#070---2024-07-20) [Compare Source](https://togithub.com/Ptrskay3/axum-prometheus/compare/0.6.1...0.7.0) ##### Changed - `MakeDefaultHandle::make_default_handle` now takes `self` as argument. This allows custom implementor structs to hold non-static data. \[[#​49](https://togithub.com/Ptrskay3/axum-prometheus/issues/49)] - Change the default initialization of `PrometheusHandle` to prevent unbounded memory growth of histograms. \[[#​52](https://togithub.com/Ptrskay3/axum-prometheus/issues/52)] - Bump `metrics` to `0.23`, `metrics-exporter-prometheus` to `0.15`. \[[#​52](https://togithub.com/Ptrskay3/axum-prometheus/issues/52)] - Document MSRV as 1.70 currently. \[[#​52](https://togithub.com/Ptrskay3/axum-prometheus/issues/52)] ##### Added - `GenericMetricLayer::pair_from` to initialize from a concrete struct. `GenericMetricLayer::pair` now requires that the handle type implements `Default`. \[[#​49](https://togithub.com/Ptrskay3/axum-prometheus/issues/49)] - `BaseMetricLayer` that serves a more lightweight alternative to `GenericMetricLayer`. \[[#​56](https://togithub.com/Ptrskay3/axum-prometheus/issues/56)]

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