fix: head is incorrect for get_pull_requests (#432)

Broken by #431. get_pull_requests requires head to be mentioned in the format $owner:$branch always

Remove exception=get_backtrace(...) pattern (#428)

## Registrator v1.9.1

[Diff since v1.9.0](v1.9.0...v1.9.1)

## Patch Fix

- Put release notes in code blocks in the General PR, to avoid github mistakenly converting # numbers into PRs/issues from General rather than the origin repo

**Merged pull requests:**
- Update TagBot.yml to latest template  (#419) (@IanButterworth)
- put release notes in a code block to avoid automatic PR links being wrong (#422) (@IanButterworth)
- Registrator 1.9.1 (#424) (@IanButterworth)
- add stdlib compat (#425) (@IanButterworth)

## Registrator v1.9.0

[Diff since v1.8.1](v1.8.1...v1.9.0)


**Closed issues:**
- Listing in https://juliapackages.com/ (#414)

**Merged pull requests:**
- Add release notes note if no release notes provided (#360) (@IanButterworth)
- Registrator.jl 1.8.0 (#417) (@IanButterworth)
- Registrator.jl 1.9.0 (#418) (@IanButterworth)

## Registrator v1.8.1

[Diff since v1.8.0](v1.8.0...v1.8.1)



**Merged pull requests:**
- isauthorized: check for nothing when fetching repo (#413) (@vdayanand)

## Registrator v1.8.0

[Diff since v1.7.0](v1.7.0...v1.8.0)



**Merged pull requests:**
- make Registrator work with the new breaking version of RegistryTools (#397) (@KristofferC)
- Change assertion to "if" and log error (#406) (@nkottary)
- Add note for private packages (#407) (@nkottary)
- Fix WebUI tag check for subdir packages (#408) (@nkottary)
- Update Project.toml (#409) (@nkottary)

make Registrator work with the new breaking version of RegistryTools (#…

…397)

* make Registrator work with the new breaking version of RegistryTools

* update RegistryTools version

* fix bug

* fix passing a RegistryTools.Project to `pfile_hasfields`

* add back constructor

## Registrator v1.5.0

[Diff since v1.4.0](v1.4.0...v1.5.0)


**Closed issues:**
- error while trying to register new package rev (#378)
- Fail to register?? (#385)
- The `Project.toml` and `Manifest.toml` files are out of sync (#389)
- Fail to register New package: McCabeThiele v0.1.1 #69238 (#393)

**Merged pull requests:**
- Update to the latest recommended CompatHelper configuration (#375) (@DilumAluthge)
- Fix constructor (#379) (@nkottary)
- Upgrade to support HTTP.jl 1.0 release (#381) (@quinnj)
- The `JuliaRegistries/Registrator.jl` README should link to the `JuliaRegistries/General` README (#386) (@DilumAluthge)
- Set up GitHub Actions CI on this repository (#387) (@DilumAluthge)
- Re-resolve and update the `Manifest.toml` file; continue using Julia 1.7.2 for the manifest file (#388) (@DilumAluthge)
- Support Bitbucket (#392) (@zot)
- Cleaning up a chunk of code (#394) (@zot)
- Add URIs to Project.toml's compat (#395) (@zot)

## Registrator v1.4.0

[Diff since v1.3.0](v1.3.0...v1.4.0)



**Merged pull requests:**
- Update RegistryTools to 1.8, update Registrator version to 1.4 (#373) (@nkottary)

## Registrator v1.3.0

[Diff since v1.2.9](v1.2.9...v1.3.0)


**Closed issues:**
- Display more info when unauthorized to release a package (#312)
- "it looks like you are not a publicly listed member/owner in the parent organization" (#351)
- Registration of new package fails (#359)
- Lighter version of NeuralFieldEq.jl (#366)

**Merged pull requests:**
- typo: dependancies -> dependencies (#353) (@marwahaha)
- Update the `/Manifest.toml` file (#357) (@DilumAluthge)
- Option to push registration commits to a fork of the registry repo (#358) (@nkottary)
- Make sure that the `JuliaRegistrator` bot never tries to at-ping itself (#361) (@DilumAluthge)
- Support SSH urls for the registry (#362) (@nkottary)
- Revert "Support SSH urls for the registry" (#363) (@nkottary)
- remove printlns (#367) (@nkottary)
- Added instructions for triggering a new release with existing package (#368) (@jlperla)
- Fix broken link to "automatic merging guidelines" (#370) (@NHDaly)
- Catch and display read_project error (#371) (@nkottary)
- fix: incorrect repo name value when url ends with .git (#372) (@vdayanand)