chore(deps): update opentelemetry gems

This MR contains the following updates:

Package	Update	Change
opentelemetry-exporter-otlp (source, changelog)	patch	0.26.1 -> 0.26.2
opentelemetry-sdk (source, changelog)	minor	'~> 1.3.0' -> '~> 1.4.0'

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Release Notes

open-telemetry/opentelemetry-ruby (opentelemetry-exporter-otlp)

v0.26.2

• FIXED: Align endpoint environment variable handling with spec
• FIXED: Require csv for ruby-3.4 compatibility
• FIXED: Add context to metrics reporting of buffer-full events

open-telemetry/opentelemetry-ruby (opentelemetry-sdk)

v1.4.0

• ADDED: Add spans to Trace::ExportError

v1.3.2

• FIXED: Reduce allocations on GraphQL hot paths
• FIXED: Add context to metrics reporting of buffer-full events

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