[8.19](backport #45886) Match prometheus version with upstream prometheusreceivers'

[mergify]

Proposed commit message

Match the prometheus/prometheus version used by upstream prometheusreceiver to avoid dependency conflict in elastic-agent

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

Why is it required

Description

Currently, prometheusreceiver uses an unreleased version of prometheus/prometheus

	github.com/prometheus/prometheus v0.304.3-0.20250703114031-419d436a447a
	github.com/stretchr/testify v1.10.0

which uses the latest version of oteltranslator ( reverted in the v0.305.0 release prometheus/prometheus@3253ba6 )

This mismatch is causing dependency conflict when updating otel collector dependencies in elastic-agent

Compilation error as follows

> build: Building elastic-agent
# github.com/prometheus/prometheus/storage/remote/otlptranslator/prometheusremotewrite
../pkg/mod/github.com/prometheus/prometheus@v0.305.0/storage/remote/otlptranslator/prometheusremotewrite/helper.go:155:30: undefined: otlptranslator.NormalizeLabel
../pkg/mod/github.com/prometheus/prometheus@v0.305.0/storage/remote/otlptranslator/prometheusremotewrite/helper.go:167:32: undefined: otlptranslator.NormalizeLabel
../pkg/mod/github.com/prometheus/prometheus@v0.305.0/storage/remote/otlptranslator/prometheusremotewrite/helper.go:207:26: undefined: otlptranslator.NormalizeLabel
Error: running "go build -o build/elastic-agent -buildmode pie -trimpath -ldflags -s -X github.com/elastic/elastic-agent/version.buildTime=2025-08-08T15:33:17Z -X github.com/elastic/elastic-agent/version.commit=7e374e8177f915f9c2a9bd806ab43fe0c9f121f7 -X github.com/elastic/elastic-agent/internal/pkg/release.snapshot=" failed with exit code 1

---

This is an automatic backport of pull request #45886 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 2e0b894 has failed:

On branch mergify/bp/8.19/pr-45886
Your branch is up to date with 'origin/8.19'.

You are currently cherry-picking commit 2e0b89426.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   NOTICE.txt
	both modified:   go.mod
	both modified:   go.sum

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[elasticmachine]

Pinging @elastic/elastic-agent-data-plane (Team:Elastic-Agent-Data-Plane)

[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b mergify/bp/8.19/pr-45886 upstream/mergify/bp/8.19/pr-45886
git merge upstream/8.19
git push upstream mergify/bp/8.19/pr-45886