chore: update bats to bats-core@latest

Pivot from the ancient abandonware version to the modern community
version.

Bats is not a Go project, but it is fetchable via `go get`, so use
that tooling to pull it in.

.gitignore

@@ -5,3 +5,4 @@ dist/
 result.xml
 .task/
 test/integration/tmp/
+test/integration/vendor/

Taskfile.yml

@@ -24,6 +24,8 @@ tasks:
       - go install github.com/boumenot/gocover-cobertura@latest
       - go install mvdan.cc/gofumpt@latest
       - go install github.com/goreleaser/goreleaser@latest
+      - go get github.com/bats-core/bats-core@latest
+      - bash $(go env GOMODCACHE)/$(go list -m github.com/bats-core/bats-core | tr ' ' @)/install.sh ./test/integration/vendor/bats
 
   deps:check:
     desc: Check dependencies needed for development

go.mod

@@ -17,6 +17,7 @@ require (
 )
 
 require (
+	github.com/bats-core/bats-core v1.11.0 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
 	github.com/fsnotify/fsnotify v1.7.0 // indirect
 	github.com/gabriel-vasile/mimetype v1.4.3 // indirect

go.sum

@@ -1,5 +1,7 @@
 github.com/avfs/avfs v0.33.0 h1:5WQXbUbr6VS7aani39ZN2Vrd/s3wLnyih1Sc4ExWTxs=
 github.com/avfs/avfs v0.33.0/go.mod h1:Q59flcFRYe9KYkNMfrLUJney3yeKGQpcWRyxsDBW7vI=
+github.com/bats-core/bats-core v1.11.0 h1:4gOM+vAg0gGry/G3rZhkkxxUgJjtpyaYdwwd4D8Rw/8=
+github.com/bats-core/bats-core v1.11.0/go.mod h1:Fyz3Anl7OPc6kY1H3BilTcoa6skn3mS3lAUbm6EnMEE=
 github.com/caarlos0/go-version v0.1.1 h1:1bikKHkGGVIIxqCmufhSSs3hpBScgHGacrvsi8FuIfc=
 github.com/caarlos0/go-version v0.1.1/go.mod h1:Ze5Qx4TsBBi5FyrSKVg1Ibc44KGV/llAaKGp86oTwZ0=
 github.com/cpuguy83/go-md2man/v2 v2.0.3/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=