changelog: add items to cover the bumping of bbolt to v1.3.7

[ahrtr]

Linked to #15221

Signed-off-by: Benjamin Wang wachao@vmware.com

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

[codecov-commenter]

Codecov Report

Merging #15224 (9816e8e) into main (5ae405e) will decrease coverage by 0.09%.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##             main   #15224      +/-   ##
==========================================
- Coverage   74.67%   74.58%   -0.09%     
==========================================
  Files         415      415              
  Lines       34317    34317              
==========================================
- Hits        25627    25597      -30     
- Misses       7051     7077      +26     
- Partials     1639     1643       +4     

Flag	Coverage Δ
all	74.58% <ø> (-0.09%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
client/v3/leasing/util.go	91.66% <0.00%> (-6.67%)	⬇️
client/pkg/v3/fileutil/purge.go	68.85% <0.00%> (-6.56%)	⬇️
client/v3/namespace/watch.go	87.87% <0.00%> (-6.07%)	⬇️
server/storage/mvcc/kvstore_compaction.go	95.74% <0.00%> (-4.26%)	⬇️
server/etcdserver/api/rafthttp/msgappv2_codec.go	67.82% <0.00%> (-3.48%)	⬇️
server/etcdserver/api/v3rpc/watch.go	83.49% <0.00%> (-2.86%)	⬇️
client/v3/concurrency/election.go	79.68% <0.00%> (-2.35%)	⬇️
server/storage/mvcc/kvstore.go	89.00% <0.00%> (-1.42%)	⬇️
client/v3/retry_interceptor.go	66.06% <0.00%> (-0.91%)	⬇️
client/v3/watch.go	92.48% <0.00%> (-0.78%)	⬇️
... and 9 more

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[spzala]

Thanks @ahrtr !!