Update module github.com/flosch/pongo2 to v6

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
github.com/flosch/pongo2	require	major	v0.0.0-20200529170236-5abacdfa4915 -> v6.0.0

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Release Notes

flosch/pongo2

### [`v6.0.0`](https://togithub.com/flosch/pongo2/blob/HEAD/CHANGELOG#v600) [Compare Source](https://togithub.com/flosch/pongo2/compare/v5.0.0...v6.0.0) - Go 1.18 is now the minimum required Go version. - Improved block performance ([#​293](https://togithub.com/flosch/pongo2/issues/293)). - Support for variable subscript syntax (for maps/arrays/slices), such as `mymap["foo"]` or `myarray[0]` ([#​281](https://togithub.com/flosch/pongo2/issues/281)). - Backwards-incompatible change: `block.Super` won't be escaped anymore by default ([#​301](https://togithub.com/flosch/pongo2/issues/301)). - `nil` is now supported in function calls ([#​277](https://togithub.com/flosch/pongo2/issues/277)). Thanks to all contributors. ### [`v5.0.0`](https://togithub.com/flosch/pongo2/compare/v4.0.2...v5.0.0) [Compare Source](https://togithub.com/flosch/pongo2/compare/v4.0.2...v5.0.0) ### [`v4.0.2`](https://togithub.com/flosch/pongo2/compare/v4.0.1...v4.0.2) [Compare Source](https://togithub.com/flosch/pongo2/compare/v4.0.1...v4.0.2) ### [`v4.0.1`](https://togithub.com/flosch/pongo2/compare/v4.0.0...v4.0.1) [Compare Source](https://togithub.com/flosch/pongo2/compare/v4.0.0...v4.0.1)

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