fix(deps): update golang.org/x/exp digest to fe59bbe

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
golang.org/x/exp	require	digest	93d18d7 -> fe59bbe

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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: core/go.sum

Command failed: go get -d -t ./...
go: errors parsing go.mod:
/tmp/renovate/repos/github/open-feature/flagd/core/go.mod:5: unknown directive: toolchain

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[renovate]

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