Update the repo URL for the SindbadTEM.jl package: specifically, add the .jl in the URL

[lazarusA]

While trying to register a new version of this package (which lives in a monorepo) I keep getting

Error while trying to register: Changing package repo URL not allowed, please submit a pull request with the URL change to the target registry and retry.

then I noticed that the outer package/project has the correct url (note the .jl)

name = "Sindbad"
uuid = "36c3e672-7dee-4606-99b5-7e5d8d85a313"
repo = "https://github.com/LandEcosystems/Sindbad.jl.git"

but SindbadTEM is missing the .jl, that might explain the error. Please advise / confirm.

LandEcosystems/Sindbad.jl@ae01281

[DilumAluthge]

1. I have verified that the old URL redirects to the new URL in the browser.
2. The PR preserves the trailing .git
3. The only change in this PR is to add the .jl
4. The Treecheck CI job is passing.