Create an 0.4.6.4-rc changelog.

changes/bug40317

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-  o Minor bugfixes (control, sandbox):
-    - Allows the control command SAVECONF to succeed when the seccomp
-      sandbox is enabled. Makes SAVECONF keep only one backup file to
-      simplify implementation. Fixes bug 40317; bugfix on 0.2.5.4-alpha.
-      Patch by Daniel Pinto.

changes/bug40375

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-  o Minor bugfixes (consensus handling):
-    - Avoid a set of bugs that could be caused by inconsistently preferring
-      an out-of-date consensus stored in a stale directory cache over
-      a more recent one stored on disk as the latest consensus.
-      Fixes bug 40375; bugfix on 0.3.1.1-alpha.

changes/bug40399

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-  o Minor features (compatibility):
-    - Remove an assertion function related to TLS renegotiation.
-      It was used nowhere outside the unit tests, and it was breaking
-      compilation with recent alpha releases of OpenSSL 3.0.0.
-      Closes ticket 40399.

changes/ticket40370

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-  o Minor bugfix (metrics port):
-    - Fix a bug that made tor try to re-bind() every 60 seconds on an already
-      open MetricsPort. Fixes bug 40370; bugfix on 0.4.5.1-alpha.
-

changes/ticket40374

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-  o Removed features:
-    - Remove unneeded code for parsing private keys in directory documents.
-      This code was only used for client authentication in v2 onion
-      services, which are now unsupported.  Closes ticket 40374.