[Automation] Bump product version numbers

[elastic-observability-automation]

Bump release versions in the config/versions.yml

Update config/versions.yml apm-agent-go 2.7.11

change detected: * key "$.versioning_systems.apm-agent-go.current" updated from "2.7.9" to "2.7.11", in file "config/versions.yml"

v2.7.11

Update config/versions.yml elasticsearch-client-dotnet 9.4.2

change detected: * key "$.versioning_systems.elasticsearch-client-dotnet.current" updated from "9.4.1" to "9.4.2", in file "config/versions.yml"

9.4.1

## What's Changed

* Regenerate client by @flobernd in https://github.com/elastic/elasticsearch-net/pull/8899 and https://github.com/elastic/elasticsearch-net/pull/8907
  * Fixes (de-)serialization of unions with three or more variants — previously, hand-rolled union converters could fail to select the correct variant
  * Search response shape fix in `InnerHits`: the `Fields` property is split into `Field` (single-field selector using `Fields`) and a new `Fields` collection of `FieldAndFormat` — existing usages of `InnerHits.Fields = …` may need to be retargeted to `Field`
  * `DataStreamLifecycle` gains `EffectiveRetention` and `RetentionDeterminedBy`; new `GlobalRetention` and `RetentionSource` types; `GetDataLifecycleResponse` now exposes `GlobalRetention`
  * Reindex rethrottle response now models parent task progress via the new `ParentReindexStatus` type
  * Inference and `_mvt` content-type alignment: `chat_completion_unified` / `stream_completion` send `Content-Type: application/json`; `_mvt` uses the versioned `application/vnd.elasticsearch+vnd.mapbox-vector-tile` Accept header


**Full Changelog**: https://github.com/elastic/elasticsearch-net/compare/9.4.0...9.4.1

9.4.2

## What's Changed

* Add plugin-defined (non-exhaustive) variant registry by @flobernd in https://github.com/elastic/elasticsearch-net/pull/8911
  * Unknown discriminators on variant union families (properties, analyzers, char filters, token filters, tokenizers, repositories, similarity settings, aggregations, queries, etc.) now deserialize into an `Unknown*` carrier and re-serialize losslessly — no data is dropped for plugin-defined or future variants the client doesn't model
  * Opt into strong typing by registering a CLR type for a discriminator: `settings.Variants.Register<IProperty, MyPluginProperty>("my_plugin")`; registrations are scoped per client instance and AOT-safe — see the [Plugin-defined variant types](https://www.elastic.co/docs/reference/elasticsearch/clients/dotnet/plugin-defined-variants) documentation for details
* Regenerate client by @flobernd in https://github.com/elastic/elasticsearch-net/pull/8908 and https://github.com/elastic/elasticsearch-net/pull/8917
  * Generated `Unknown*` carrier types for all variant families (properties, analyzers, char filters, token filters, tokenizers, repositories, similarity settings, aggregations, queries, suggesters, rescorers) to support the non-exhaustive variant registry
  * Improved XML documentation coverage across generated client methods, request/response types, and type members that previously had no IntelliSense descriptions

**Full Changelog**: https://github.com/elastic/elasticsearch-net/compare/9.4.1...9.4.2

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