chore(deps): bump go.opentelemetry.io/otel/exporters/prometheus in /internal/demo

[dependabot]

Bumps go.opentelemetry.io/otel/exporters/prometheus in /internal/demo from 0.67.0 to 0.68.0.

Updates go.opentelemetry.io/otel/exporters/prometheus from 0.67.0 to 0.68.0

Changelog

Sourced from go.opentelemetry.io/otel/exporters/prometheus's changelog.

[1.46.0/0.68.0/0.22.0/0.0.19] - 2026-08-25

This release is the last to support [Go 1.25]. The next release will require at least [Go 1.26].

Added

• Support testing of [Go 1.27]. (#8811)
• Support http/json protocol in go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp. (#8273, #8775, #8831)
• Add Hasher struct and methods in go.opentelemetry.io/otel/attribute to compute authoritative Distinct hashes incrementally for attribute filtering and deduplication. (#8598)

Changed

• Lazily evaluate filtered and dropped attributes on measurement hot paths in go.opentelemetry.io/otel/sdk/metric to avoid unnecessary attribute set allocations. (#8598)
• Add ErrExporterShutdown to go.opentelemetry.io/otel/sdk/log and return it from the go.opentelemetry.io/otel/exporters/stdout/stdoutlog, go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc, and go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp exporters when Export is called after Shutdown. (#8773)
• Clarify in go.opentelemetry.io/otel/log that calling Logger.Enabled is optional and that cached results can become stale. (#8764)

Fixed

• Export dropped attribute counts in OTLP log records from go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc and go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp. (#8829)
• Name span events created from OpenTracing logs after the event log field, falling back to log, instead of always using an empty name in go.opentelemetry.io/otel/bridge/opentracing. (#8648)
• Count exception attributes omitted due to the attribute count limit as dropped in go.opentelemetry.io/otel/sdk/log. (#8796)
• Prevent log record and instrumentation scope attributes with empty keys from reaching processors and exporters in go.opentelemetry.io/otel/sdk/log. (#8797)
• Fix a data race when span attributes are read concurrently in go.opentelemetry.io/otel/sdk/trace. (#8706)
• Prevent a panic in (*Set).Filter when called on a nil receiver in go.opentelemetry.io/otel/attribute. (#8792)
• The simple span and log processors record otel.sdk.processor.{span,log}.processed when the record is submitted to the exporter instead of after the export completes, and no longer set error.type from the export outcome, in go.opentelemetry.io/otel/sdk/trace and go.opentelemetry.io/otel/sdk/log. (#8705)
• Prevent Resource.MarshalLog from panicking on nil resources in go.opentelemetry.io/otel/sdk/resource. (#8758)

Commits

• 58db4c8 Release v1.46.0 (#8858)
• 524fc3c chore(deps): update golang.org/x/telemetry digest to 1f5465a (#8853)
• 3b8ef6f chore(deps): update codspeedhq/action action to v5.2.1 (#8854)
• cfbeab5 attribute: clarify xxhash test purpose (#8753)
• 3599b59 sdk/log: Add interface stability markers (#8855)
• 08d52dc otlptracehttp: Accept quoted finite doubles in OTLP JSON (#8831)
• d720f5a otlplog: export dropped attribute count (#8829)
• 80fe23b chore(deps): update module honnef.co/go/tools to v0.8.1 (#8816)
• 5337812 chore(deps): update codspeedhq/action action to v5.2.0 (#8851)
• 2f73a3e chore(deps): update module github.com/uudashr/iface to v1.5.1 (#8841)
• Additional commits viewable in compare view