Update askama requirement from 0.12 to 0.14

[dependabot[bot]]

Updates the requirements on askama to permit the latest version.

Release notes

Sourced from askama's releases.

v0.14.0

Added Features

• Implement Values on tuple by @​GuillaumeGomez in askama-rs/askama#391
• Pass variables to sub-templates more reliably even if indirectly by @​Kijewski in askama-rs/askama#397
• Implement first and blank arguments for |indent by @​Kijewski in askama-rs/askama#401
• Add named arguments for builtin filters by @​Kijewski in askama-rs/askama#403
• Add unique filter by @​GuillaumeGomez in askama-rs/askama#405

Bug Fixes And Consistency

• askama_derive accidentally exposed as a feature by @​Kijewski in askama-rs/askama#384
• Track config files by @​GuillaumeGomez in askama-rs/askama#385
• If using local variable as value when creating a new variable, do not put it behind a reference by @​GuillaumeGomez in askama-rs/askama#392
• generator: make CARGO_MANIFEST_DIR part of ConfigKey by @​strickczq in askama-rs/askama#395
• Do not put question mark initialization expressions behind a reference by @​GuillaumeGomez in askama-rs/askama#400
• Update to more current rust version on readthedocs by @​Kijewski in askama-rs/askama#410
• Fix unique filter implementation by @​GuillaumeGomez in askama-rs/askama#417
• Add |titlecase as alias for |title by @​Kijewski in askama-rs/askama#416

Further Changes

• book: add page about FastWritable by @​Kijewski in askama-rs/askama#407
• Add throughput to derive benchmark by @​Kijewski in askama-rs/askama#413
• Move FastWritable into askama root by @​GuillaumeGomez in askama-rs/askama#411

New Contributors

• @​strickczq made their first contribution in askama-rs/askama#395

Full Changelog: https://github.com/askama-rs/askama/compare/v0.13.0...v0.14.0

Commits

• 95867ac Merge pull request #416 from Kijewski/pr-upgrading-0.14
• 61b7422 Add |titlecase as alias for |title
• 79be271 Run doctests
• 72bbe3e Bump version number to v0.14.0
• 5775033 book: update upgrading.md
• a5b43c0 Fix unique filter implementation
• 7fccbdf Remove usage of nextest
• 6a16256 Fix new clippy lints
• 04a4d5b Update MSRV to 1.83
• d2a788a Add doc about unique filter
• Additional commits viewable in compare view

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