Add 502 (Bad Gateway) to accepted status codes in lychee config

[sharon-wang]

helps avoid openvsx link lint errors that I saw in https://github.com/posit-dev/positron-website/actions/runs/25220317135#summary-73950641259

Errors in assistant-chat-commands-participants.qmd
[502] https://open-vsx.org/extension/posit/shiny | Rejected status code: 502 Bad Gateway (configurable with "accept" option)
Errors in develop-data-apps.qmd
[502] https://open-vsx.org/extension/posit/shiny | Error (cached)
Errors in extensions.qmd
[502] https://open-vsx.org/extension/posit/air-vscode | Rejected status code: 502 Bad Gateway (configurable with "accept" option)
[502] https://open-vsx.org/extension/posit/shiny | Error (cached)
[502] https://open-vsx.org/extension/quarto/quarto | Rejected status code: 502 Bad Gateway (configurable with "accept" option)
Errors in git.qmd
[502] https://open-vsx.org/extension/atlassian/atlascode | Rejected status code: 502 Bad Gateway (configurable with "accept" option)
[502] https://open-vsx.org/extension/GitLab/gitlab-workflow | Rejected status code: 502 Bad Gateway (configurable with "accept" option)
[502] https://open-vsx.org/extension/vscode/github | Rejected status code: 502 Bad Gateway (configurable with "accept" option)
[502] https://open-vsx.org/vscode/item?itemName=eamodio.gitlens | Rejected status code: 502 Bad Gateway (configurable with "accept" option)
Errors in migrate-rstudio-rproj.qmd
[502] https://open-vsx.org/extension/alefragnani/project-manager | Rejected status code: 502 Bad Gateway (configurable with "accept" option)
Errors in migrate-rstudio-settings-and-extensions.qmd
[502] https://open-vsx.org/extension/GitHub/vscode-github-actions | Rejected status code: 502 Bad Gateway (configurable with "accept" option)
[502] https://open-vsx.org/extension/GitLab/gitlab-workflow | Error (cached)
[502] https://open-vsx.org/extension/gvelasq/tomorrow-night-bright-r-classic | Rejected status code: 502 Bad Gateway (configurable with "accept" option)
[502] https://open-vsx.org/extension/oderwat/indent-rainbow | Rejected status code: 502 Bad Gateway (configurable with "accept" option)

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[juliasilge]

Thank you!