Provide git tag message via file for better handling

[IanButterworth]

I've got a theory that the git@github.com: Permission denied (publickey). is a red herring and what's actually happening is unescaped chars in the tag message causing git to misunderstand the tag command TagBot is sending.

As an example, below is the debug output from a failed TagBot run which has a huge and complicated message to pass into -m, and it failed.

So this PR changes to pass the tag message via a file via the the tag -F arg.

I don't know how to test this. One option is if this passes we release it and see if it fixes it?

https://github.com/timholy/ProgressMeter.jl/actions/runs/5981657741/job/16230121798

##[debug]Running 'git -C /tmp/tagbot_repo_nkebbb74 tag -m ## ProgressMeter v1.8.0
##[debug]
##[debug][Diff since v1.7.2](https://github.com/timholy/ProgressMeter.jl/compare/v1.7.2...v1.8.0)
##[debug]
##[debug]## New Features
##[debug]
##[debug]- https://github.com/timholy/ProgressMeter.jl/pull/262 `@showprogress` now can take keyword arguments. For instance:
##[debug]```julia
##[debug]@showprogress "X: " color=:red showspeed=true for x in 1:10
##[debug]    sleep(1)
##[debug]end
##[debug]```
##[debug]or to dynamically disable the progress meter, for instance via an arg `show_progress`
##[debug]```julia
##[debug]@showprogress enabled=show_progress for x in 1:10
##[debug]    sleep(1)
##[debug]end
##[debug]```
##[debug]
##[debug]**Closed issues:**
##[debug]- Enabled keyword for macro @showprogress (#229)
##[debug]
##[debug]**Merged pull requests:**
##[debug]- Update README.md to account for signature change (#227) (@moyner)
##[debug]- Update README.md (#240) (@yakir12)
##[debug]- Structure docs more (#247) (@rikhuijzer)
##[debug]- Generalize CI check in tests. (#252) (@maleadt)
##[debug]- Add development/debugging tips on redirecting output to another terminal. (#257) (@fredrikekre)
##[debug]- Make @showprogress support keyword arguments (#262) (@dhanak)
##[debug]- enable dependabot for GitHub actions (#263) (@ranocha)
##[debug]- Bump actions/cache from 1 to 3 (#264) (@dependabot[bot])
##[debug]- Bump actions/checkout from 2 to 3 (#265) (@dependabot[bot])
##[debug]- Bump codecov/codecov-action from 1 to 3 (#266) (@dependabot[bot])
##[debug]- Missing unit "seconds" in doc string (#268) (@mschauer) v1.8.0 1ac7bbb3d342aeee835ae841e6712f494ff9bfff'
##[debug]Running 'git -C /tmp/tagbot_repo_nkebbb74 push origin v1.8.0'
git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.

[IanButterworth]

I'm realizing that git@github.com: Permission denied (publickey) may actually just be a bad ssh key. I'll close this if confirmed

[IanButterworth]

Indeed it was an old ssh key. Evidently this isn't needed as the referenced tag worked.