examples/shv-nxboot-updater: use downgraded pyshv==0.8.0

The problem probably arises from an incompatibility issue
between the shv-libs4c and pyshv libraries. The fix is to downgrade
the library for now and then revert back.

Signed-off-by: Stepan Pressl <pressl.stepan@gmail.com>
diff --git a/examples/shv-nxboot-updater/update-script/requirements.txt b/examples/shv-nxboot-updater/update-script/requirements.txt
index c3b0be3..b2c6ea5 100644
--- a/examples/shv-nxboot-updater/update-script/requirements.txt
+++ b/examples/shv-nxboot-updater/update-script/requirements.txt
@@ -1,4 +1,4 @@
-pyshv>=0.10.0
+pyshv==0.8.0
 PyQt6
 argparse
 asyncio
diff --git a/examples/shv-nxboot-updater/update-script/shvconfirm.py b/examples/shv-nxboot-updater/update-script/shvconfirm.py
index cc9bd06..b017434 100644
--- a/examples/shv-nxboot-updater/update-script/shvconfirm.py
+++ b/examples/shv-nxboot-updater/update-script/shvconfirm.py
@@ -18,8 +18,7 @@
 #
 ############################################################################
 
-from shv.rpcapi.valueclient import SHVValueClient
-from shv.rpcurl import RpcUrl
+from shv import RpcUrl, SHVValueClient
 
 
 async def shv_confirm(connection: str, path_to_root: str) -> None:
diff --git a/examples/shv-nxboot-updater/update-script/shvflasher.py b/examples/shv-nxboot-updater/update-script/shvflasher.py
index bb55bdc..8a5be6a 100644
--- a/examples/shv-nxboot-updater/update-script/shvflasher.py
+++ b/examples/shv-nxboot-updater/update-script/shvflasher.py
@@ -22,9 +22,7 @@
 import io
 import zlib
 
-from shv import SHVBytes
-from shv.rpcapi.valueclient import SHVValueClient
-from shv.rpcurl import RpcUrl
+from shv import RpcUrl, SHVBytes, SHVValueClient
 
 
 async def shv_flasher(