devices: gunnar: Promote to 23.0

Change-Id: I35ccbfcf6223c7f1892a3fd7d825c97f20ab078d

Author: tangalbert919

_data/devices/gunnar.yml

@@ -12,7 +12,7 @@ codename: gunnar
 cpu: Kryo 660
 cpu_cores: '8'
 cpu_freq: 2 x 2.2 GHz + 6 x 1.7 GHz
-current_branch: 22.2
+current_branch: 23.0
 custom_unlock_cmd: 'fastboot flashing unlock'
 dimensions: {depth: 7.5, height: 159.9, width: 73.2}
 download_boot: With the device powered off, hold <kbd>Volume Down</kbd> + <kbd>Power</kbd>.
@@ -40,5 +40,5 @@ tree: android_device_oneplus_gunnar
 type: phone
 vendor: OnePlus
 vendor_short: oneplus
-versions: [22.2]
+versions: [22.2, 23.0]
 wifi: 802.11 a/b/g/n/ac