Update version

[gammazero]

New version includes retrieval optimization.

[github-actions[bot]]

Suggested version: v0.5.6

Comparing to: v0.5.5 (diff)

Changes in go.mod file(s):

diff --git a/go.mod b/go.mod
index 4e0b564..47c147f 100644
--- a/go.mod
+++ b/go.mod
@@ -45,7 +45,7 @@ require (
    github.com/ipfs/go-log/v2 v2.5.1
    github.com/ipfs/go-merkledag v0.11.0
    github.com/ipfs/go-unixfs v0.4.5
-   github.com/ipfs/go-unixfsnode v1.8.0
+   github.com/ipfs/go-unixfsnode v1.9.0
    github.com/ipld/go-car v0.6.1
    github.com/ipld/go-car/v2 v2.13.1
    github.com/ipld/go-codec-dagpb v1.6.0

gorelease says:

# github.com/data-preservation-programs/singularity/handler/file
## incompatible changes
FilecoinRetriever.RetrieveReader: added

# github.com/data-preservation-programs/singularity/retriever
## compatible changes
(*Retriever).RetrieveReader: added

# diagnostics
go.sum: one or more sums are missing. Run 'go mod tidy' to add missing sums.
required module github.com/microcosm-cc/bluemonday@v1.0.21 retracted by module author: Retract older versions as only latest is to be depended upon

# summary
Suggested version: v0.6.0

gocompat says:

Your branch is up to date with 'origin/main'.

Automatically created GitHub Release

A draft GitHub Release has been created. It is going to be published when this PR is merged. You can modify its' body to include any release notes you wish to include with the release.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (70c9147) 73.86% compared to head (ad73d49) 73.92%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #407 +/- ## ========================================== + Coverage 73.86% 73.92% +0.06% ========================================== Files 149 149 Lines 9813 9813 ========================================== + Hits 7248 7254 +6 + Misses 1813 1809 -4 + Partials 752 750 -2 ``` [see 2 files with indirect coverage changes](https://app.codecov.io/gh/data-preservation-programs/singularity/pull/407/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=data-preservation-programs)

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