Prepare changelogs for new releases (#1754)

Update changelogs before publishing crates and releasing Mountpoint.

### Does this change impact existing behavior?

No.

### Does this change need a changelog entry? Does it require a version
change?

Yes.

---

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license and I agree to the terms of
the [Developer Certificate of Origin
(DCO)](https://developercertificate.org/).

Signed-off-by: Alessandro Passaro <alexpax@amazon.co.uk>

Author: passaro

mountpoint-s3-client/CHANGELOG.md

@@ -1,4 +1,6 @@
-## Unreleased (v0.19.6)
+## Unreleased
+
+## v0.19.6 (January 22, 2026)
 
 * Upgrade cargo dependencies.
 * Update to latest CRT dependencies.

mountpoint-s3-crt-sys/CHANGELOG.md

@@ -1,4 +1,6 @@
-## Unreleased (v0.16.0)
+## Unreleased
+
+## v0.16.0 (January 22, 2026)
 
 * Upgrade cargo dependencies.
 * Update to latest CRT dependencies.

mountpoint-s3-crt/CHANGELOG.md

@@ -1,4 +1,6 @@
-## Unreleased (v0.13.6)
+## Unreleased
+
+## v0.13.6 (January 22, 2026)
 
 * Upgrade cargo dependencies.
 * Update to latest CRT dependencies.

mountpoint-s3-fs/CHANGELOG.md

@@ -1,4 +1,6 @@
-## Unreleased (v0.9.0 (January 06, 2025))
+## Unreleased
+
+## v0.9.0 (January 22, 2026)
 
 * Update Mountpoint's semantics to enable opening a new file handle on an inode if all the existing open handles have been flushed. ([#1704](https://github.com/awslabs/mountpoint-s3/pull/1704))
 * Upgrade cargo dependencies.

mountpoint-s3/CHANGELOG.md

@@ -1,4 +1,6 @@
-## Unreleased (v1.22.0)
+## Unreleased
+
+## v1.22.0 (January 22, 2026)
 
 ### Breaking changes
 
@@ -7,7 +9,7 @@
 ### Other changes
 
 * Add metric to track cache hit rate in logs. ([#1716](https://github.com/awslabs/mountpoint-s3/pull/1716))
-* Remove redundant cache merics in logs. ([#1716](https://github.com/awslabs/mountpoint-s3/pull/1716), [#1721](https://github.com/awslabs/mountpoint-s3/pull/1721))
+* Remove redundant cache metrics in logs. ([#1716](https://github.com/awslabs/mountpoint-s3/pull/1716), [#1721](https://github.com/awslabs/mountpoint-s3/pull/1721))
 * Update cache metrics for consistency. ([#1721](https://github.com/awslabs/mountpoint-s3/pull/1721), [#1738](https://github.com/awslabs/mountpoint-s3/pull/1738))
 * Add cache metrics for OTLP export. ([#1724](https://github.com/awslabs/mountpoint-s3/pull/1724))