Update askama requirement from 0.11 to 0.12

[dependabot]

Updates the requirements on askama to permit the latest version.

Release notes

Sourced from askama's releases.

0.12.0

After 13 months of development, we're happy to announce the 0.12.0 release of Askama, the type safe, compiled Jinja-like template engine for Rust. For this release, @​Kijewski contributed most of the changes -- @​vallentin and @​djc are the other team members. This releases comes with integrations for Actix-Web 4, Axum 0.6, Gotham 0.7, hyper 0.14, Tide 0.16 and Warp 0.3. We removed our Iron integration, since this framework no longer seems to be actively maintained.

Features

• Add markdown filter (#622, #641)
• Add suppress_whitespace config option (#664, thanks to @​GuillaumeGomez)
• Add minimize config for whitespace and add handling of ~ in the parser (#673, thanks to @​GuillaumeGomez)
• Implement basic hyper integration (#706)
• Determine Content-Type at compile time (#594)
• Parse tuple expressions (#608)
• Allow comments in {% match %} (#616)
• Expose the fact that templates implement Display (#654)
• Allow {% endmacro name %} (#681, thanks to @​Eijebong)
• Enable tracking of the offending span of an error (#628)

Removed

• Remove support for deprecated _parent field (#613)
• Remove ext argument in integrations (#632)
• Removed Iron integration (#595)

Fixes

• Make capitalize filter Unicode-aware (#652, thanks to @​Kl4rry)
• Fail to parse if keyword is not longest identifier (#742)
• Fix invalid check (#678, thanks to @​GuillaumeGomez)
• Fully qualify more paths in generated code (#601)
• Make sure #[template] attribute is used exactly once (#603)
• Fix json/yaml feature forwarding (#610, thanks to @​jannik4)
• Remove panic!() in loop.cycle([]) (#617)

Documentation

• Document macro import syntax (#691, thanks to @​ojacobson)
• Fix minor issues in escape documentation (#734, thanks to @​AndrolGenhald)
• Extend documentation for (#744, thanks to @​saona-raimundo)

Internal improvements

• Unify handling of calls (#614)
• Optimize parsing of ranges (#597)
• Remove unneeded external dependencies (630)
• Move all template creation into askama_shared (#647)
• Implement std::error::Error::source() (#655)
• Move features into derive crate (#662, thanks to @​genusistimelord)
• Remove unsafe code from askama_escape (#665)
• Expose features in integration crates (#688)
• Add caching action to shrink CI times (#698, thanks to @​ludicast)

... (truncated)

Commits

• 417cb92 Bump versions for Askama 0.12 (#784)
• 4a7068d exchange hyper features From<Template> for hyper::Body with TryFrom
• c9613ff Fix typos
• 70c5784 Revert "derive: Make Config 'static"
• 9f3325c Replace toml_edit with basic-toml
• 32f0799 Add impl From<{Template}> for hyper::Body derive
• c131154 Update comrak dependency to 0.16
• 7b6f1df derive: refactor parser
• 63b98ec Extends expects a string and nothing else
• 071106d Use toml_edit instead of toml
• Additional commits viewable in compare view

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