Add v0.11.2 changelog (#484)

CHANGELOG.md

+## v0.11.2 (22th November 2023)
+
+- #484: Support Python v3.12 on v0.11 release
+
+### Pre-requisites
+
+- disable `pylint` and `pyupgrade` hooks
+- switch jobs to `3.12` image containing `pre-commit`
+- !195, duniterpy#205+: Fix `gitlab-ci-linter` hook
+
+### Support Python v3.12
+
+- !237, #457: Drop Python v3.7 support
+- Bump `pendulum` to `v3.0.0b1`
+- !238, !250, #448: Add support for Python v3.12
+
 ## v0.11.1 (14th August 2023)
 
 Bug fix release, because `libnacl` brought in a breaking change.