backend/oci/deps: Pin flock to v0.10.0

[radeksimko]

This is to make it possible to build on Solaris again.

https://github.com/hashicorp/terraform/actions/runs/14590452943/job/40924318795#step:4:663

Background

An old version of flock (0.8.1) was brought in as a dependency of https://github.com/oracle/oci-go-sdk which itself was introduced in #36872

Pinning transitive dependencies downstream like this is not ideal as we have no control over compatibility between the direct and transitive dependency. i.e. we cannot guarantee on the level of Terraform that the pinned version of flock is and remains compatible with current and future versions of OCI SDK.

As a result, this was raised upstream:

• Update gofrs/flock to v0.10.0+ to support Solaris oracle/oci-go-sdk#570

Target Release

1.13.x

CHANGELOG entry

• This change is user-facing and I added a changelog entry.
• This change is not user-facing.

[github-actions]

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