CI: labeler: Add stm32 target

Add a label for changes in the stm32 target.

Fixes: 851e7f77e424 ("stm32: add new stm32 target")
Link: https://github.com/openwrt/openwrt/pull/17058
Signed-off-by: Hauke Mehrtens <[email protected]>

.github/labeler.yml

@@ -180,6 +180,13 @@
 - changed-files:
   - any-glob-to-any-file:
     - "target/linux/starfive/**"
+"target/stm32":
+- changed-files:
+  - any-glob-to-any-file:
+    - "target/linux/stm32/**"
+    - "package/boot/arm-trusted-firmware-stm32/**"
+    - "package/boot/optee-os-stm32/**"
+    - "package/boot/uboot-stm32/**"
 "target/sunxi":
 - changed-files:
   - any-glob-to-any-file: