Fix backup plugin

Update required Python version
Update pyln and other packages
Update README

README.md

@@ -8,6 +8,7 @@ Community curated plugins for Core-Lightning.
 
 | Name                                 | Short description                                                                           |
 | ------------------------------------ | ------------------------------------------------------------------------------------------- |
+| [backup][backup]                     | A simple and reliable backup plugin                                                         |
 | [boltz-channel-creation][boltz]      | A Core-Lightning plugin for Boltz Channel Creation Swaps                                    |
 | [btcli4j][btcli4j]                   | A Bitcoin Backend to enable safely the pruning mode, and support also rest APIs.            |
 | [circular][circular]                 | A smart rebalancing plugin for Core Lightning routing nodes                                 |
@@ -49,7 +50,6 @@ If you like a plugin from that list, feel free to update and fix it, so we can u
 | Name                                 | Short description                                                                           |
 | ------------------------------------ | ------------------------------------------------------------------------------------------- |
 | [autopilot][autopilot]               | An autopilot that suggests channels that should be established                              |
-| [backup][backup]                     | A simple and reliable backup plugin                                                         |
 | [commando][commando]                 | This plugin allows to send commands between nodes                                           |
 | [drain][drain]                       | Draining, filling and balancing channels with automatic chunks.                             |
 | [helpme][helpme]                     | This plugin is designed to walk you through setting up a fresh Core-Lightning node          |

backup/pyproject.toml

@@ -5,19 +5,20 @@ description = "Keep your Core-Lightning node save by backing it up, in real-time
 authors = ["Christian Decker <decker@blockstream.com>"]
 
 [tool.poetry.dependencies]
-python = "^3.7"
+python = "^3.8"
-pyln-client = "0.12.1"
+pyln-client = "^23.11"
 click = "^8.0.4"
 tqdm = "^4.62.3"
-psutil = "5.9.4"
+psutil = "^5.9.4"
-flask = "2.2.2"
+flask = "^2.2"
+werkzeug = "<3"
 
 [tool.poetry.group.dev.dependencies]
-pyln-testing = "0.12.1"
+pyln-testing = "^23.11"
 flaky = "^3.7.0"
-pytest-timeout = "^2.1.0"
+pytest-timeout = "^2.2.0"
 pytest-xdist = "^3.1.0"
 
 [build-system]
-requires = ["poetry-core>=1.0.0"]
+requires = ["poetry-core"]
 build-backend = "poetry.core.masonry.api"