Upgrade Thanos

[aknuds1]

What this PR does

Upgrade Thanos to 2315a3a60a35.

This revision includes improvement to shipper error message when thanos.shipper.json is invalid.

Which issue(s) this PR fixes

Fixes #1241.

Checklist

• [na] Tests updated
• [na] Documentation added
• [ na] CHANGELOG.md updated - the order of entries should be [CHANGE], [FEATURE], [ENHANCEMENT], [BUGFIX]

[pracucci]

Moving to draft. We have to accurately check all Thanos changes we're going to vendor. Last time I checked I remember there was a change we may not want to get (but unfortunately I don't remember which one...).

[aknuds1]

Moving to draft. We have to accurately check all Thanos changes we're going to vendor. Last time I checked I remember there was a change we may not want to get (but unfortunately I don't remember which one...).

@pracucci thanks, I was about to move to draft myself seeing it doesn't build.

[aknuds1]

The filesystem bucket implementation in Thanos has changed, to not treat missing files as an error.

[pstibrany]

We have to accurately check all Thanos changes we're going to vendor. Last time I checked I remember there was a change we may not want to get (but unfortunately I don't remember which one...).

I checked Thanos changes, and cannot identify the one we wouldn't want. PR looks good to me.

There is new support in Thanos S3 client to use AWS-SDK auth, which we may want to expose at some point, but it doesn't need to be in this PR.