Update tzdata to 2021c

Author: pganssle

NEWS.md

@@ -1,3 +1,33 @@
+# Version 2021.3
+Upstream version 2021c released 2021-10-01T21:21:49+00:00
+
+## Briefly:
+
+Revert most 2021b changes to 'backward'. Fix 'zic -b fat' bug in pre-1970 32-bit
+data. Fix two Link line typos. Distribute SECURITY file.
+
+This release is intended as a bugfix release, to fix compatibility problems and
+typos reported since 2021b was released.
+
+## Changes to Link directives
+
+Revert almost all of 2021b's changes to the 'backward' file, by moving Link
+directives back to where they were in 2021a. Although 'zic' doesn't care which
+source file contains a Link directive, some downstream uses ran into trouble
+with the move. (Problem reported by Stephen Colebourne for Joda-Time.)
+
+Fix typo that linked Atlantic/Jan_Mayen to the wrong location (problem reported
+by Chris Walton).
+
+Fix 'backzone' typo that linked America/Virgin to the wrong location (problem
+reported by Michael Deckers).
+
+## Changes to documentation
+
+Distribute the SECURITY file (problem reported by Andreas Radke).
+
+---
+
 # Version 2021.2.post0
 Upstream version 2021b released 2021-09-24T23:23:00+00:00
 
@@ -76,6 +106,7 @@ Antarctica/Syowa.
 tzfile.5 better matches a draft successor to RFC 8536
 <https://datatracker.ietf.org/doc/draft-murchison-rfc8536bis/01/>.
 
+
 ---
 
 # Version 2021.2

VERSION

@@ -1 +1 @@
-2021.2.post0
+2021.3

news.d/2021c.md

@@ -0,0 +1,27 @@
+# Version 2021.3
+Upstream version 2021c released 2021-10-01T21:21:49+00:00
+
+## Briefly:
+
+Revert most 2021b changes to 'backward'. Fix 'zic -b fat' bug in pre-1970 32-bit
+data. Fix two Link line typos. Distribute SECURITY file.
+
+This release is intended as a bugfix release, to fix compatibility problems and
+typos reported since 2021b was released.
+
+## Changes to Link directives
+
+Revert almost all of 2021b's changes to the 'backward' file, by moving Link
+directives back to where they were in 2021a. Although 'zic' doesn't care which
+source file contains a Link directive, some downstream uses ran into trouble
+with the move. (Problem reported by Stephen Colebourne for Joda-Time.)
+
+Fix typo that linked Atlantic/Jan_Mayen to the wrong location (problem reported
+by Chris Walton).
+
+Fix 'backzone' typo that linked America/Virgin to the wrong location (problem
+reported by Michael Deckers).
+
+## Changes to documentation
+
+Distribute the SECURITY file (problem reported by Andreas Radke).

src/tzdata/__init__.py

@@ -1,6 +1,6 @@
 # IANA versions like 2020a are not valid PEP 440 identifiers; the recommended
 # way to translate the version is to use YYYY.n where `n` is a 0-based index.
-__version__ = "2021.2.post0"
+__version__ = "2021.3"
 
 # This exposes the original IANA version number.
-IANA_VERSION = "2021b"
+IANA_VERSION = "2021c"