Match prometheus version with upstream prometheusreceivers'

[khushijain21]

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

[github-actions]

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Just comment with:

• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)

[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @khushijain21? 🙏.
For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-8./d is the label to automatically backport to the 8./d branch. /d is the digit
• backport-active-all is the label that automatically backports to all active branches.
• backport-active-8 is the label that automatically backports to all active minor branches for the 8 major.
• backport-active-9 is the label that automatically backports to all active minor branches for the 9 major.

[elasticmachine]

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

[khushijain21]

/test

[ishleenk17]

@khushijain21 : Could you share details of this downgrade of the library ?
Was it breaking something ?

[khushijain21]

Hello @ishleenk17, I updated the description with more details, can you take a look again?