bump: Update opentelemetry version

[RasmusRendal]

Bumps all the opentelemetry crates to version 0.32 of the SDK.

This involves some changes to opentelemetry_instrumentation_tower
(Previously known as tower_otel_http_metrics). The only visible change is
that when adding a metrics layer, the service_name is no longer required,
as the global meter is now always used by default.

I verified that all dependencies use the correct version of the SDK by
running cargo tree --duplicates -p opentelemetry

[RasmusRendal]

They moved tower-otel-http-metrics to opentelemetry-rust-contrib. In the move, they seem to have forgotten to update it with the new opentelemetry release. We'll have to wait for opentelemetry-instrumentation-tower to end up on crates.io.

Someone uploaded a opentelemetry-instrumentation-tower release to crates.io, but I'd prefer to wait until https://crates.io/teams/github:open-telemetry:rust-publishers has ownership of this crate before we start using it.

The upstream issue related to the crate being published is open-telemetry/opentelemetry-rust-contrib#619

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.83%. Comparing base (97385db) to head (c8bd580).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/axum.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #26      +/-   ##
==========================================
+ Coverage   74.18%   75.83%   +1.65%     
==========================================
  Files           5        5              
  Lines         275      269       -6     
==========================================
  Hits          204      204              
+ Misses         71       65       -6     

Files with missing lines	Coverage Δ
src/axum.rs	0.00% <0.00%> (ø)

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