Bump elastic-apm-go to latest version

[apmmachine]

Bump elastic-apm-go to latest version

Set org.label-schema.version in Dockerfile

1 file(s) updated with "org.label-schema.version=\"v2.6.0\"": * Dockerfile

v2.6.0

Release published on the 2024-04-11 12:47:45 +0000 UTC at the url https://github.com/elastic/apm-agent-go/releases/tag/v2.6.0

## What's Changed
* build(deps): bump google.golang.org/protobuf from 1.26.0-rc.1 to 1.33.0 in /module/apmbeego by @dependabot in https://github.com/elastic/apm-agent-go/pull/1587
* build(deps): bump google.golang.org/protobuf from 1.31.0 to 1.33.0 in /internal/apmgodog by @dependabot in https://github.com/elastic/apm-agent-go/pull/1591
* build(deps): bump google.golang.org/protobuf from 1.26.0-rc.1 to 1.33.0 in /module/apmprometheus by @dependabot in https://github.com/elastic/apm-agent-go/pull/1586
* build(deps): bump google.golang.org/protobuf from 1.30.0 to 1.33.0 in /module/apmgin by @dependabot in https://github.com/elastic/apm-agent-go/pull/1590
* build(deps): bump google.golang.org/protobuf from 1.31.0 to 1.33.0 in /module/apmgokit by @dependabot in https://github.com/elastic/apm-agent-go/pull/1588
* build(deps): bump google.golang.org/protobuf from 1.31.0 to 1.33.0 in /module/apmgrpc by @dependabot in https://github.com/elastic/apm-agent-go/pull/1589
* build(deps): bump github.com/jackc/pgx/v5 from 5.0.4 to 5.5.4 in /module/apmpgxv5 by @dependabot in https://github.com/elastic/apm-agent-go/pull/1592
* build(deps): bump github.com/jackc/pgx/v5 from 5.4.3 to 5.5.4 in /module/apmgormv2 by @dependabot in https://github.com/elastic/apm-agent-go/pull/1593
* Add apm/sqlserver module to apmsql doc by @dmathieu in https://github.com/elastic/apm-agent-go/pull/1595
* Specify `go get` needs to run within go modules by @dmathieu in https://github.com/elastic/apm-agent-go/pull/1599
* [Automation] Update JSON server schema specs by @apmmachine in https://github.com/elastic/apm-agent-go/pull/1601
* feat: bump minimum go version to 1.21 by @kruskall in https://github.com/elastic/apm-agent-go/pull/1602
* Allow adding links after tx/span creation in agent, and handle `AddLink` in apmotel by @dmathieu in https://github.com/elastic/apm-agent-go/pull/1605
* feat: bump version to 2.6.0 by @kruskall in https://github.com/elastic/apm-agent-go/pull/1606


**Full Changelog**: https://github.com/elastic/apm-agent-go/compare/v2.5.0...v2.6.0

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