fix: rust-servo_arc0.3: fix upstream-name to match component name

[binujp]

rust-servo_arc0.3: fix upstream-name to match component name

Verified with koji build:
koji/taskinfo?taskID=1128245
closed buildSRPMFromSCM (/microsoft/azurelinux.git:da92dd5f27aee919a13f6c22249435aab01f6656)
closed buildArch (rust-servo_arc0.3-0.3.0-1.azl4bootstrap.20260405.src.rpm, x86_64)
closed buildArch (rust-servo_arc0.3-0.3.0-1.azl4bootstrap.20260405.src.rpm, aarch64)

Merge Checklist

All boxes should be checked before merging the PR (just tick any boxes which don't apply to this PR)

• The toolchain has been rebuilt successfully (or no changes were made to it)
• The toolchain/worker package manifests are up-to-date
• Any updated packages successfully build (or no packages were changed)
• Packages depending on static components modified in this PR (Golang, *-static subpackages, etc.) have had their Release tag incremented.
• Package tests (%check section) have been verified with RUN_CHECK=y for existing SPEC files, or added to new SPEC files
• All package sources are available
• cgmanifest files are up-to-date and sorted (./cgmanifest.json, ./toolkit/scripts/toolchain/cgmanifest.json, .github/workflows/cgmanifest.json)
• LICENSE-MAP files are up-to-date (./LICENSES-AND-NOTICES/SPECS/data/licenses.json, ./LICENSES-AND-NOTICES/SPECS/LICENSES-MAP.md, ./LICENSES-AND-NOTICES/SPECS/LICENSE-EXCEPTIONS.PHOTON)
• All source files have up-to-date hashes in the *.signatures.json files
• sudo make go-tidy-all and sudo make go-test-coverage pass
• Documentation has been updated to match any changes to the build system
• Ready to merge

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Summary

What does the PR accomplish, why was it needed?

Change Log

• Change
• Change
• Change

Does this affect the toolchain?

YES/NO

Associated issues

• #xxxx

Links to CVEs

• https://nvd.nist.gov/vuln/detail/CVE-YYYY-XXXX

Test Methodology

• Pipeline build id: xxxx

[Copilot]

Pull request overview

Updates the component definition for rust-servo_arc0.3 to point at the correct upstream Fedora package name and a new pinned Fedora 43 dist-git commit, aligning the spec source with the component’s intended package.

Changes:

• Update spec.upstream-name to rust-servo_arc0.3.
• Update the pinned spec.upstream-commit SHA for Fedora 43.

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[Copilot]

This pin uses upstream-commit but doesn’t include a reference URL to the external source (e.g., the Fedora dist-git commit URL for this SHA). Per .github/instructions/comp-toml.instructions.md ("References" section), please add a full URL (and optionally branch=f43) so future readers can quickly verify what this commit corresponds to; the existing TODO exit condition is good.

Suggested change

	# Pin to the f43 commit used to build the current Fedora 43 package.
	# Pin to the f43 commit used to build the current Fedora 43 package.
	# Fedora dist-git reference: https://src.fedoraproject.org/rpms/rust-servo_arc0.3/c/26fb741a69d37cbd9093724585d97a5da5d6d14c?branch=f43

[christopherco]