Update opentelemetry-stdout requirement from 0.5 to 0.26

[dependabot[bot]]

Updates the requirements on opentelemetry-stdout to permit the latest version.

Release notes

Sourced from opentelemetry-stdout's releases.

0.26.0 Release

See changelog for individual crates to know the exact set of changes. As informed during previous release, all crates from this repo follows same version (0.26.0 for this release). This release also upgrades Metric API (part of opentelemetry crate) from alpha to beta.

Commits

• 21fc16c Prepare 0.26.0 release, update Metrics API to Beta (#2160)
• 167baf8 Minor cleanups in Metrics module (#2155)
• 380a709 MeterProvider modified to not do shutdown if user has already shut down (#2156)
• 81a95e3 Improve internal opentelemetry logging - directly using tracing mcros (#2152)
• 8bdd189 For Delta Temporarlity, avoid exporting when no new measurements are made (#2...
• 6ed2b43 Fix CI - Regenerate proto files, and selective msrv-patching (#2159)
• 161929d Use weaver for semantic convention codegen (#2098)
• 0f15d21 Update doc comments (#2149)
• 88023d9 Add tests for periodic reader from various RT combinations (#2147)
• c8136d9 Add with_boundaries hint API for explicit bucket histograms (#2135)
• Additional commits viewable in compare view

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