dependencies: update max qdarkstyle

Previously we stuck with version 2.6.8 as that had no deps but later
versions introduced several deps. However, now latest version only
has two dependencies (one of which has the same maintainer).
Futher, there are some bugs with 2.6.8 when used with new Qt,
e.g. with dropdowns that I want fixed (which it is in the newer ones).

related https://github.com/ColinDuquesnoy/QDarkStyleSheet/issues/182

contrib/deterministic-build/requirements.txt

@@ -42,6 +42,9 @@ dnspython==1.16.0 \
 ecdsa==0.15 \
     --hash=sha256:867ec9cf6df0b03addc8ef66b56359643cb5d0c1dc329df76ba7ecfe256c8061 \
     --hash=sha256:8f12ac317f8a1318efa75757ef0a651abe12e51fc1af8838fb91079445227277
+helpdev==0.7.1 \
+    --hash=sha256:779a761b18c2d96fb181aa699609f802347806125f2fee2f60dad875a625e38e \
+    --hash=sha256:bb62a79acbac141dadf42cadeb92bb7450dd18b9824a62043b6a0b149190db3d
 idna==2.9 \
     --hash=sha256:7588d1c14ae4c77d74036e8c22ff447b26d0fde8f007354fd48a7814db15b7cb \
     --hash=sha256:a068a21ceac8a4d63dbfd964670474107f541babbd2250d61922f029858365fa
@@ -101,12 +104,15 @@ pyaes==1.6.1 \
     --hash=sha256:02c1b1405c38d3c370b085fb952dd8bea3fadcee6411ad99f312cc129c536d8f
 pyrsistent==0.16.0 \
     --hash=sha256:28669905fe725965daa16184933676547c5bb40a5153055a8dee2a4bd7933ad3
-QDarkStyle==2.6.8 \
-    --hash=sha256:037a54bf0aa5153f8055b65b8b36ac0d0f7648f2fd906c011a4da22eb0f582a2 \
-    --hash=sha256:fd1abae37d3a0a004089178da7c0b26ec5eb29f965b3e573853b8f280b614dea
+QDarkStyle==2.8.1 \
+    --hash=sha256:7cead57817a8a1f38b48d76ef38986b6cc397d0315c0dd0431fcd06749556947 \
+    --hash=sha256:d53b0120bddd9e3efba9801731e22ef86ed798bb5fc6a802f5f7bb32dedf0321
 qrcode==6.1 \
     --hash=sha256:3996ee560fc39532910603704c82980ff6d4d5d629f9c3f25f34174ce8606cf5 \
     --hash=sha256:505253854f607f2abf4d16092c61d4e9d511a3b4392e60bff957a68592b04369
+QtPy==1.9.0 \
+    --hash=sha256:2db72c44b55d0fe1407be8fba35c838ad0d6d3bb81f23007886dc1fc0f459c8d \
+    --hash=sha256:fa0b8363b363e89b2a6f49eddc162a04c0699ae95e109a6be3bb145a913190ea
 setuptools==46.4.0 \
     --hash=sha256:4334fc63121aafb1cc98fd5ae5dd47ea8ad4a38ad638b47af03a686deb14ef5b \
     --hash=sha256:d05c2c47bbef97fd58632b63dd2b83426db38af18f65c180b2423fea4b67e6b8

contrib/requirements/requirements.txt

@@ -3,7 +3,7 @@ ecdsa>=0.14
 qrcode
 protobuf
 dnspython
-qdarkstyle<2.7
+qdarkstyle<2.9
 aiorpcx>=0.18,<0.19
 aiohttp>=3.3.0,<4.0.0
 aiohttp_socks>=0.3