make esptool not pinned

Author: tyeth

.github/workflows/build-clang-doxy.yml

@@ -403,7 +403,7 @@ jobs:
           mv nanopb/pb.h src/nanopb/nanopb.pb.h
       - name: Install Dependencies
         run: |
-          pip install esptool==4.6
+          pip install esptool
       - name: build ESP32 platforms
         run: python3 ci/build_platform.py ${{ matrix.arduino-platform }} --build_timeout 48000
       - name: Check artifacts