chore(deps): backport go-libs migrator index name fix to release/v2.1

[Dav-14]

Summary

Backport of the go-libs migrator index name fix to flows `release/v2.1`. Bumps `github.com/formancehq/go-libs/v2` from `v2.0.1-pre` to `v2.2.5`.

The `release/v2.1` branch was created from the `v2.1.1` tag specifically to host this backport — flows previously didn't have a v2.1 release branch (the tag was cut from main at the time). This unblocks the v3.0 stack in regions chart (orchestration v2.1.1).

Pulls in formancehq/go-libs#595 (backport of #594 to `release/v2.2`) which fixes a hardcoded `idx_version_id` name collision between migrators sharing a schema. The bug crashes services with `SQLSTATE 42P10` at startup. Affected DBs self-heal on next deploy — no manual SQL required.

Larger diff than other backports because this branch was on go-libs `v2.0.1-pre`, so the bump spans several minor versions plus transitive deps.

Companion to #171 (main, still open), #172 (release/v2.6), #173 (release/v2.4).

Test plan

• `go mod tidy` clean
• `go build ./...` succeeds
• CI green

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