Foliage

Fix botched version number update in just-released version.

With this version, Foliage now increments the value of the `_version` field when performing change operations. This solves an error involving optimistic locking and versions when performing multistep operations in the _Change records_ tab.

Changes in this version:
* The _Change_ tab now lets you change item material types.
* A bug in the CSV export from the _Look up records_ tab has been fixed. If the "enhanced summary" option was selected, some records ended up with values such as `<pywebio.io_ctrl.Output object at 0x09705028>`. This should not happen anymore.
* The minimum version of Python has been increased to 3.9.

Changes in this version:
* In the dialog for entering credentials, Foliage now checks that the value given for the OKAPI URL actually looks like a URL, to help guard against a common error where the user swaps the URL and tenant ID values. Foliage also reports error messages from Folio when the user name or user password does not exist, instead of (unhelpfully) only reporting that Folio rejected the request.
* The _Look up records_ tab now prints the item loan type when the search is for item records.
* The _Look up records_ tab now has a new _Enhanced summary_ option; this adds additional computed field values to the summary table, at the cost of requiring additional time to look up the field values.
* The _Look up records_ tab now exports all values, even those not found. In the output (whether CSV or JSON), records which were not found will have empty field values except for the identifier field.
* The file `requirements.txt` has updates to versions of dependencies.

Externally, this release only updates copyright years inside files such as the LICENSE file. Internally, the Makefile commands for producing the macOS installer have been slightly tweaked.

This version fixes another bug in the _Lookup_ tab, one that occurs when printing a summary of an instance record that has an incomplete note field.