Update supported and tested Yocto versions

Update support table with Yocto 6.0 Wrynose, to be supported in dev
and lts-6.8. Remove styhead from CI builds as it's already EOL.
Qt 6.9 branch is now closed, no more changes accepted.

Change-Id: I3b9ed3fa0c88c4311dce8c008037f79cbc7fd947
Reviewed-by: Mikko Gronoff <mikko.gronoff@qt.io>
(cherry picked from commit ee8b754f62)
(cherry picked from commit e9a91afc47)

README.md

@@ -26,9 +26,10 @@ the LAYERSERIES_COMPAT (c).
 
 | Yocto \ Qt | 6.8 | 6.7 | 6.6 | 6.5 | 6.4 | 6.3 | 6.2 |
 |:---------- |:---:|:---:|:---:|:---:|:---:|:---:|:---:|
+| wrynose    |  x  |     |     |     |     |     |     |
 | whinlatter |  x  |     |     |     |     |     |     |
 | walnascar  |  x  |     |     |     |     |     |     |
-| styhead    |  x  |  c  |     |     |     |     |     |
+| styhead    |  c  |  c  |     |     |     |     |     |
 | scarthgap  |  x  |  c  |  c  |  x  |     |     |     |
 | nanbield   |  c  |  c  |  c  |  c  |     |     |     |
 | mickledore |  c  |  c  |  c  |  c  |  c  |     |     |

coin/module_config.yaml

@@ -17,7 +17,7 @@ machine_type:
 #
 #           [target1]       [target2]   [target3]       [target4]       [target5]
 # [machine] qemuarm64       qemux86-64  qemuarm         qemux86         qemuarm64
-# [yocto]   master          walnascar   scarthgap       styhead         kirkstone
+# [yocto]   master          walnascar   scarthgap       whinlatter      kirkstone
 # [wayland] yes             no          no              yes             yes
 # [mingw]   no              no          yes             no              no
 # [static]  no              no          no              no              yes
@@ -79,7 +79,7 @@ target4: &target4
       variableValue: qemux86
     - type: EnvironmentVariable
       variableName: MANIFEST
-      variableValue: styhead.xml
+      variableValue: whinlatter.xml
     - type: EnvironmentVariable
       variableName: TEST_CONFIGS
       variableValue: ci configs wayland no-webengine python