Make git a bootstrap package

It's not a build requirement, it's only required for downloading the
source.  In particular, someone building from a Cygwin source package
would get the source code as well as the cygport file, so they wouldn't
need git to build things.

.github/workflows/ci.yml

@@ -5,3 +5,4 @@ jobs:
     uses: cygporter/workflows/.github/workflows/build-test.yml@v1
     with:
       cygport_file: taskwarrior.cygport
+      bootstrap_packages: cygport git

taskwarrior.cygport

@@ -10,7 +10,7 @@ GIT_URI=https://github.com/GothenburgBitFactory/taskwarrior
 GIT_TAG="v$PV"
 LICENSE=MIT
 
-BUILD_REQUIRES='cmake gcc-fortran ninja libuuid-devel libgnutls-devel git'
+BUILD_REQUIRES='cmake gcc-fortran ninja libuuid-devel libgnutls-devel'
 
 inherit cmake
 inherit git