fix(deps): update github.com/cncf/xds/go digest to 8bfbf64

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/cncf/xds/go	require	digest	2ac532f -> 8bfbf64

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: go.sum

Command failed: go get -t ./...
go: module github.com/cncf/xds/go@v0.0.0-20251110193048-8bfbf64dc13e requires go >= 1.24; switching to go1.24.10
go: downloading go1.24.10 (linux/amd64)
go: download go1.24.10: golang.org/toolchain@v0.0.1-go1.24.10.linux-amd64: verifying module: checksum database disabled by GOSUMDB=off