coin: switch CI target master -> nanbield

Qt 6.5.4 (WebEngine) does not support newer than
nanbield yocto branch due uncompatible python version.

Change-Id: I4da3bd9ade089d0ae51b354197f4610cbe37c616
Reviewed-by: Samuli Piippo <samuli.piippo@qt.io>

README.md

@@ -22,7 +22,7 @@ the LAYERSERIES_COMPAT (c).
 
 | Yocto \ Qt | 6.5 | 6.4 | 6.3 | 6.2 |
 | ---------- |:---:|:---:|:---:|:---:|
-| master     |  x  |     |     |     |
+| master     |     |     |     |     |
 | nanbield   |  x  |     |     |     |
 | mickledore |  x  |  x  |     |     |
 | langdale   |  c  |  x  |     |     |

coin/module_config.yaml

@@ -17,7 +17,7 @@ machine_type:
 #
 #           [target1]       [target2]   [target3]       [target4]       [target5]
 # [machine] qemuarm64       qemux86     qemuarm         qemux86-64      qemuarm64
-# [yocto]   nanbield        master      mickledore      dunfell         kirkstone
+# [yocto]   nanbield        nanbield    mickledore      dunfell         kirkstone
 # [X11]     no              no          yes             yes             no
 # [mingw]   no              yes         no              no              no
 # [static]  no              no          no              no              yes
@@ -47,7 +47,7 @@ target2: &target2
       variableValue: qemux86
     - type: EnvironmentVariable
       variableName: MANIFEST
-      variableValue: master.xml
+      variableValue: nanbield.xml
     - type: EnvironmentVariable
       variableName: TEST_CONFIGS
       variableValue: ci configs wayland mingw no-webengine lts