Update Rust crate opentelemetry to 0.33.0

[renovate]

This PR contains the following updates:

Package	Type	Change
opentelemetry (source)	workspace.dependencies	0.32.0 → 0.33.0

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Release Notes

open-telemetry/opentelemetry-rust (opentelemetry)

v0.33.0

Compare Source

Released 2026-Sep-18

• Fix TraceState accepting more than the 32 list-members the W3C trace-context
  specification allows. from_str, from_key_value and insert now keep at most
  32, dropping members from the end of the list as the specification prescribes, so
  neither a parsed nor a locally built tracestate can exceed the limit.
• Added experimental support for a global context event observer. A
  ContextObserver can be registered via GlobalContextObserver::set to be
  notified of context transitions through the on_context_enter and
  on_context_exit callbacks. This feature is primarily intended to publish a
  different view of the current context (the ObserverContextView) through
  alternative channels that let external readers (e.g. an eBPF profiler) track
  the current context. See the associated
  OTEP.
  Gated behind the experimental_context_observer feature flag.
• otel_info!, otel_warn!, otel_debug!, and otel_error! macros now accept quoted-key fields
  (e.g. "otel.component.type" = "value") for dotted attribute names.
• Added BoundGauge<T> and BoundUpDownCounter<T> types (and the
  corresponding Gauge::bind() / UpDownCounter::bind() methods), completing
  the experimental bound-instrument API across all sync instruments
  (Counter, UpDownCounter, Histogram, Gauge). Gated behind the
  experimental_metrics_bound_instruments feature flag.

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