pkg: bump 2.1dev & chlog sections (#17109)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: Borda

src/lightning/app/CHANGELOG.md

@@ -5,6 +5,33 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 
+## [UnReleased] - 2023-MM-DD
+
+### Added
+
+-
+
+
+### Changed
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+### Depercated
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+### Removed
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+### Fixed
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+
 ## [2.0.0] - 2023-03-15
 
 ### Added

src/lightning/fabric/CHANGELOG.md

@@ -5,6 +5,33 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 
+## [UnReleased] - 2023-MM-DD
+
+### Added
+
+-
+
+
+### Changed
+
+-
+
+
+### Depercated
+
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+
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+### Removed
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+### Fixed
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 ## [2.0.0] - 2023-03-15
 
 ### Added

src/lightning/pytorch/CHANGELOG.md

@@ -5,6 +5,33 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 
+## [UnReleased] - 2023-MM-DD
+
+### Added
+
+-
+
+
+### Changed
+
+-
+
+
+### Depercated
+
+-
+
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+### Removed
+
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+
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+### Fixed
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 ## [2.0.0] - 2023-03-15
 
 ### Added

src/version.info

@@ -1 +1 @@
-2.0.0
+2.1.0dev