Move changelog files for 0.13.0

changelog/0.13.0_2024-07-26/pull-267

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+Change: Update dependencies and require Go 1.18 or newer
+
+Most dependencies have been updated. Since some libraries require newer language
+features, support for Go 1.17 has been dropped, which means that rest-server
+now requires at least Go 1.18 to build.
+
+https://github.com/restic/rest-server/pull/267

changelog/0.13.0_2024-07-26/pull-271

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+Enhancement: Print listening address after start-up
+
+When started with `--listen :0`, rest-server would print `start server on :0`
+
+The message now also includes the actual address listened on, for example
+`start server on 0.0.0.0:37333`. This is useful when starting a server with
+an auto-allocated free port number (port 0).
+
+https://github.com/restic/rest-server/pull/271

changelog/0.13.0_2024-07-26/pull-272

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+Enhancement: Support listening on a unix socket
+
+It is now possible to make rest-server listen on a unix socket by prefixing
+the socket filename with `unix:` and passing it to the `--listen` option,
+for example `--listen unix:/tmp/foo`.
+
+This is useful in combination with remote port forwarding to enable a remote
+server to backup locally, e.g.:
+
+```
+rest-server --listen unix:/tmp/foo &
+ssh -R /tmp/foo:/tmp/foo user@host restic -r rest:http+unix:///tmp/foo:/repo backup
+```
+
+https://github.com/restic/rest-server/pull/272

changelog/0.13.0_2024-07-26/pull-273

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+Change: Shut down cleanly on TERM and INT signals
+
+Rest-server now listens for TERM and INT signals and cleanly closes down the
+http.Server and listener when receiving either of them.
+
+This is particularly useful when listening on a unix socket, as the server
+will now remove the socket file when it shuts down.
+
+https://github.com/restic/rest-server/pull/273