sysutils/tealdeer: update to 1.6.0

v1.6.0 (2022-10-02)

It's been 9 months since the last release already! This is not a huge update
feature-wise, but it still contains a few nice new improvements and a few
bugfixes, contributed by 11 different people. The most important new feature
is probably the option to override the cache directory through the config file.
The TEALDEER_CACHE_DIR env variable is now deprecated.

A note to packagers: Shell completions have been moved to the
completion/ subdirectory! Packaging scripst might need to be updated.

Changes:
[added] Allow overriding cache directory through config (#276)
[added] Add --no-auto-update CLI flag (#257)
[added] Show note about auto-updates when cache is missing (#254)
[added] Add support for android platform (#274)
[added] Add custom pages to list output (#285)
[fixed] Cache: Return error if HTTP client cannot be created (#247)
[fixed] Handle cache download errors (#253)
[fixed] Do not page output of tldr --update (#231)
[fixed] Create macOS release builds with bundled root certificates (#272)
[fixed] Clean up and fix shell completions (#262)
[deprecated] The TEALDEER_CACHE_DIR env variable is now deprecated (#276)
[removed] The --config-path command was removed, use --show-paths instead (#290)
[removed] The -o/--os command was removed, use -p/--platform instead (#290)
[removed] The -m/--markdown command was removed, use -r/--raw instead (#290)
[chore] Move shell completion scripts to their own directory (#259)
[chore] Update dependencies (#271, #287, #291)
[chore] Use anyhow for error handling (#249)
[chore] Switch to Rust 2021 edition (#284)

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