inno: bump keyring to 18.0.1 to avoid AttributeError (issue6043)

The error seems to be harmless, because it happens after closing the connection.
For whatever reason, this isn't bundled with the Wix installer.

https://github.com/jaraco/keyring/issues/386
https://bitbucket.org/Mekk/mercurial_keyring/issues/63/attributeerror-during-process-finish-with

contrib/packaging/inno/requirements.txt

@@ -1,38 +1,38
 #
 # This file is autogenerated by pip-compile
 # To update, run:
 #
 #    pip-compile --generate-hashes contrib/packaging/inno/requirements.txt.in -o contrib/packaging/inno/requirements.txt
 #
 certifi==2018.11.29 \
     --hash=sha256:47f9c83ef4c0c621eaef743f133f09fa8a74a9b75f037e8624f83bd1b6626cb7 \
     --hash=sha256:993f830721089fef441cdfeb4b2c8c9df86f0c63239f06bd025a76a7daddb033 \
     # via dulwich
 configparser==3.7.3 \
     --hash=sha256:27594cf4fc279f321974061ac69164aaebd2749af962ac8686b20503ac0bcf2d \
     --hash=sha256:9d51fe0a382f05b6b117c5e601fc219fede4a8c71703324af3f7d883aef476a3 \
     # via entrypoints
 docutils==0.14 \
     --hash=sha256:02aec4bd92ab067f6ff27a38a38a41173bf01bed8f89157768c1573f53e474a6 \
     --hash=sha256:51e64ef2ebfb29cae1faa133b3710143496eca21c530f3f71424d77687764274 \
     --hash=sha256:7a4bd47eaf6596e1295ecb11361139febe29b084a87bf005bf899f9a42edc3c6
 dulwich==0.19.11 \
     --hash=sha256:afbe070f6899357e33f63f3f3696e601731fef66c64a489dea1bc9f539f4a725
 entrypoints==0.3 \
     --hash=sha256:589f874b313739ad35be6e0cd7efde2a4e9b6fea91edcc34e58ecbb8dbe56d19 \
     --hash=sha256:c70dd71abe5a8c85e55e12c19bd91ccfeec11a6e99044204511f9ed547d48451 \
     # via keyring
-keyring==18.0.0 \
-    --hash=sha256:12833d2b05d2055e0e25931184af9cd6a738f320a2264853cabbd8a3a0f0b65d \
-    --hash=sha256:ca33f5ccc542b9ffaa196ee9a33488069e5e7eac77d5b81969f8a3ce74d0230c
+keyring==18.0.1 \
+    --hash=sha256:67d6cc0132bd77922725fae9f18366bb314fd8f95ff4d323a4df41890a96a838 \
+    --hash=sha256:7b29ebfcf8678c4da531b2478a912eea01e80007e5ddca9ee0c7038cb3489ec6
 pygments==2.3.1 \
     --hash=sha256:5ffada19f6203563680669ee7f53b64dabbeb100eb51b61996085e99c03b284a \
     --hash=sha256:e8218dd399a61674745138520d0d4cf2621d7e032439341bc3f647bff125818d
 pywin32-ctypes==0.2.0 \
     --hash=sha256:24ffc3b341d457d48e8922352130cf2644024a4ff09762a2261fd34c36ee5942 \
     --hash=sha256:9dc2d991b3479cc2df15930958b674a48a227d5361d413827a4cfd0b5876fc98 \
     # via keyring
 urllib3==1.24.1 \
     --hash=sha256:61bf29cada3fc2fbefad4fdf059ea4bd1b4a86d2b6d15e1c7c0b582b9752fe39 \
     --hash=sha256:de9529817c93f27c8ccbfead6985011db27bd0ddfcdb2d86f3f663385c6a9c22 \
     # via dulwich