Update Rust crate prometheus-client to 0.22.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
prometheus-client	dependencies	minor	0.19.0 -> 0.22.0

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Release Notes

prometheus/client_rust (prometheus-client)

v0.22.2

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Added

• Added Gauge<u32, AtomicU32> implementation.
  See PR 191.

v0.22.1

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Added

• Added EncodeLabelValue and EncodeLabelKey implementations for Arc,
  Rc, and Box.
  See PR 188.

v0.22.0

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Changed

• Simplify Collector trait by enabling Collector::collect to encode metrics directly with a DescriptorEncoder.
  See PR 149 for details.

v0.21.2

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Added

• Added sub_registry_with_labels method to Registry.
  See PR 145.
• Added with_labels and with_prefix_and_labels constructors to Registry.
  See PR 147.

v0.21.1

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Added

• Implement EncodeLabelValue for Option<T>.
  See PR 137.

v0.21.0

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Changed

• Replace impl EncodeMetric for RefCell<T> with a new type ConstFamily implementing EncodeMetric.

v0.20.0

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Added

• Introduce Collector abstraction allowing users to provide additional metrics
  and their description on each scrape. See PR 82.

• Introduce a #[prometheus(flatten)] attribute which can be used when deriving EncodeLabelSet, allowing
  a nested struct to be flattened during encoding. See PR 118.

  For example:

  #[derive(EncodeLabelSet, Hash, Clone, Eq, PartialEq, Debug)]
  struct CommonLabels {
      a: u64,
      b: u64,
  }
  #[derive(EncodeLabelSet, Hash, Clone, Eq, PartialEq, Debug)]
  struct Labels {
      unique: u64,
      #[prometheus(flatten)]
      common: CommonLabels,
  }

  Would be encoded as:

  my_metric{a="42",b="42",unique="42"} 42
  

Fixed

• Fix label encoding in protobuf feature. See PR 123.

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