chore(deps): Update otel sdk

[ndyakov]

Note

Medium Risk
Moderate risk because CI/toolchain is bumped to Go 1.25 and OpenTelemetry dependency versions are upgraded, which can introduce build/runtime incompatibilities in the redisotel* extras and OTel examples.

Overview
Updates the project’s Go baseline to 1.25 across GitHub Actions (composite test action plus build.yml, doctests.yaml, and Redis Enterprise workflow), ensuring CI runs on Go 1.25.x by default.

Refreshes OpenTelemetry-related modules in extra/redisotel, extra/redisotel-native, and the OTel examples by bumping OTel packages to v1.43.0 (plus related indirect deps like grpc-gateway, grpc, and x/*), and updating example/otel to newer uptrace-go and backoff/v5 dependency sets.

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[jit-ci]

🛡️ Jit Security Scan Results

✅ No security findings were detected in this PR

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[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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