rust: Upgrade rust to 1.86.0

[KavyaSree2610]

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

---

Summary

What does the PR accomplish, why was it needed?

• Upgrade rust to 1.86.0

Change Log

• Upgrade rust to 1.86.0
• Remove unnecessary patch

Does this affect the toolchain?

NO

Associated issues

• https://microsoft.visualstudio.com/OS/_workitems/edit/57540202

Links to CVEs

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

Test Methodology

• Buddy build: https://dev.azure.com/mariner-org/mariner/_build/results?buildId=808465&view=results
• https://dev.azure.com/mariner-org/mariner/_build/results?buildId=809543&view=results
• Full build id: 3.0.20250514-kkaitepalli-808990

[kgodara912]

Package builds, tests and installs file. Full build is also fine. Except minor typo, LGTM.

For extended repo packages, if you build it next time in buddy build, please put the extended repo packages in extended specs section along with rust in specs section of buddy build because full build doesn't build extended repo. Though they may not cause issue for this change but good to test them to ensure that we don't cause any regression in extended repo.

[KavyaSree2610]

Package builds, tests and installs file. Full build is also fine. Except minor typo, LGTM.

For extended repo packages, if you build it next time in buddy build, please put the extended repo packages in extended specs section along with rust in specs section of buddy build because full build doesn't build extended repo. Though they may not cause issue for this change but good to test them to ensure that we don't cause any regression in extended repo.

Updated the buddy build link in which Extended Specs are also built with rust