Update otel/opentelemetry-collector Docker tag to v0.104.0

This MR contains the following updates:

Package	Type	Update	Change
otel/opentelemetry-collector		minor	0.103.1 -> 0.104.0
otel/opentelemetry-collector	ironbank-docker	minor	0.103.1 -> 0.104.0
otel/opentelemetry-collector	stage	minor	0.103.1 -> 0.104.0

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Release Notes

open-telemetry/opentelemetry-collector-releases (otel/opentelemetry-collector)

v0.104.0

Compare Source

Check the v0.104.0 contrib changelog and the v0.104.0 core changelog for changelogs on specific components.

⚠ The Core repository's release includes 2 very important breaking changes.

1. The otlpreceiver now uses localhost by default instead of 0.0.0.0. This may break the receiver in containerized environments like Kubernetes. If you depend on 0.0.0.0 disable the component.UseLocalHostAsDefaultHost feature gate or explicitly set the endpoint to 0.0.0.0.
2. Expansion of BASH-style environment variables, such as $FOO is no longer supported by default. If you depend on this syntax, disable the confmap.unifyEnvVarExpansion feature gate, but know that the feature will be removed in the future in favor of ${env:FOO}.

Changelog

• ee2830f Update version to 0.104.0 (#​587)
• 3cc7340 Add rabbitmq exporter to otelcol-contrib release (#​581)

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