Fixes the following security issue:
CVE-2020-28473: The package bottle from 0 and before 0.12.19 are vulnerable
to Web Cache Poisoning by using a vector called parameter cloaking. When
the attacker can separate query parameters using a semicolon (;), they can
cause a difference in the interpretation of the request between the proxy
(running with default configuration) and the server. This can result in
malicious requests being cached as completely safe ones, as the proxy would
usually not see the semicolon as a separator, and therefore would not
include it in a cache key of an unkeyed parameter.
In addition, bottle 0.12.18 fixed a compatibility issue with python 3.8+:
https://github.com/bottlepy/bottle/issues/1181
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
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