Fix name of tarballs for patch releases (#6296)

Since the latest updates to our release process which transitioned to
merge queues it appears that patch release create incorrectly named
tarballs. The version in the tarball is based on the branch name, which
doesn't change for patch releases, so the version needs to come from
`Cargo.toml`. Thankfully there's already a helpful shell script to do
that so use the shell script instead of using the branch name.

ci/build-src-tarball.sh

@@ -5,7 +5,7 @@ set -ex
 # Determine the name of the tarball
 tag=dev
 if [[ $GITHUB_REF == refs/heads/release-* ]]; then
-  tag=v${GITHUB_REF:19}
+  tag=v$(./ci/print-current-version.sh)
 fi
 pkgname=wasmtime-$tag-src
 

ci/build-tarballs.sh

@@ -22,7 +22,7 @@ mkdir -p dist
 
 tag=dev
 if [[ $GITHUB_REF == refs/heads/release-* ]]; then
-  tag=v${GITHUB_REF:19}
+  tag=v$(./ci/print-current-version.sh)
 fi
 
 bin_pkgname=wasmtime-$tag-$platform