Upgrade prometheus to 0.14.0 (#4598)

# Description of Changes

Upgrades the rust SDK's prometheus dependency from 0.13 to 0.14.

Fixes #4597

# API and ABI breaking changes

[The prometheus
changelog](https://github.com/tikv/rust-prometheus/blob/master/CHANGELOG.md#0140)
claims that the MSRV for the new version is 1.82, but this project
doesn't seem to have an official MSRV, so I don't think that's an ABI
change.

I don't think depending on a different prometheus version is itself a
breaking change. Prometheus is exposed through the rust SDK, but in an
explicitly [unstable
module](https://github.com/clockworklabs/SpacetimeDB/blob/3f58b5951bf3c49971c51aecb526439597b9c044/sdks/rust/src/lib.rs#L69-L76)
which "may change incompatibly without a major version bump". Prometheus
structs are also exposed from several crates, but with the same
disclaimers about unstable interfaces.

# Expected complexity level and risk

1. This is a module bump with simple-looking changes.

# Testing

- [x] Just confirmed everything still compiles and the tests still pass

Co-authored-by: Zeke Foppa <196249+bfops@users.noreply.github.com>

Author: SupernaviX

Cargo.lock

@@ -249,7 +249,7 @@ pgwire = { version = "0.34.2", default-features = false, features = ["server-api
 postgres-types = "0.2.5"
 pretty_assertions = { version = "1.4", features = ["unstable"] }
 proc-macro2 = "1.0"
-prometheus = "0.13.0"
+prometheus = "0.14.0"
 proptest = "1.4"
 proptest-derive = "0.5"
 quick-junit = { version = "0.3.2" }

Cargo.toml

@@ -23,7 +23,7 @@ serde = "1.0.136"
 serde_json = { version = "1.0", features = ["raw_value"] }
 anyhow = { version = "1.0.57", features = ["backtrace"] }
 regex = "1"
-prometheus = "0.13.0"
+prometheus.workspace = true
 email_address = "0.2.3"
 tempfile.workspace = true
 async-trait = "0.1.60"