Drop Ubuntu end-of-life Ubuntu 22.10 from test matrix

The Ubuntu 22.10 CI jobs started failing on `apt` steps. The likely
explanation is that this is due to Ubuntu 22.10 being end-of-life since
July 2023.

The most reasonably solution seems to be to decide that we don't test
with end-of-life non-LTS Ubuntu versions. This commit executes on that.

.github/workflows/main.yml

@@ -95,14 +95,13 @@ jobs:
     runs-on: ubuntu-latest
     # Build & test job should be run on:
     # - All Ubuntu versions officially supported by Zivid SDK
-    # - All Ubuntu versions newer than the latest LTS
+    # - All (not end-of-life) Ubuntu versions newer than the latest LTS
     # - The three latest Fedora releases that we can support
     strategy:
       matrix:
         os:
           - ubuntu:20.04
           - ubuntu:22.04
-          - ubuntu:22.10
           - ubuntu:23.04
           - fedora:35
           - fedora:36

README.md

@@ -169,7 +169,6 @@ Please visit [Zivid Knowledge Base][zivid-knowledge-base-url] for general inform
 | Operating System | Python version            |
 | :--------------- | :------------------------ |
 | Ubuntu 23.04     | 3.11                      |
-| Ubuntu 22.10     | 3.10                      |
 | Ubuntu 22.04     | 3.10                      |
 | Ubuntu 20.04     | 3.8                       |
 | Fedora 37        | 3.11                      |