fix: Allow SAM-T version update GHA to get latest tag

[jfuss]

There are two issues this patch fixes:

1. the sed for updating the SAM-T version was flipped causing an invalid base.txt
2. The default fetch depth is 1 causing only the latest commit to be pulled. For some reason, this causes the tag "git describe" returns nothing. With a fetch depth of 0, we get the right value.

Which issue(s) does this change fix?

none

Why is this change necessary?

See above commit message

How does it address the issue?

See above commit message

What side effects does this change have?

None

Proof it works this time :) https://github.com/jfuss/aws-sam-cli/actions/runs/4943420245/jobs/8837895491

Mandatory Checklist

PRs will only be reviewed after checklist is complete

• Add input/output type hints to new functions/methods
• Write design document if needed (Do I need to write a design document?)
• Write/update unit tests
• Write/update integration tests
• Write/update functional tests if needed
• make pr passes
• make update-reproducible-reqs if dependencies were changed
• Write documentation

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.