INTPYTHON-589 Fix invocation of version bump script in release process (#304)

Author: blink1073

.github/scripts/bump-version.sh

@@ -2,4 +2,4 @@
 set -eu
 
 CURRENT_VERSION=$(NO_EXT=1 python setup.py --version)
-sed -i '' "s/__version__ = \"${CURRENT_VERSION}\"/__version__ = \"$1\"/" "pymongoarrow/version.py"
+sed -i "s/__version__ = \"${CURRENT_VERSION}\"/__version__ = \"$1\"/" "pymongoarrow/version.py"

bindings/python/pymongoarrow/version.py

@@ -12,6 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-__version__ = "1.7.2"
+__version__ = "1.8.0.dev0"
 
 _MIN_LIBBSON_VERSION = "1.23.1"