fix non-ascii filename mojibake when uploaded

[saitouena]

before: 日本語ファイル名.txt -> ?????.txt
after: 日本語ファイル名.txt -> 日本語ファイル名.txt

This patch requires patched version of clj-http (dakrone/clj-http#522), so CI fails for now.

how to try this patch

$ git clone git@github.com:toyokumo/clj-http.git
$ cd clj-http
$ git checkout add-option-to-add-multipart-charset
$ rm -rf ~/.m2/repository/clj-http/clj-http/3.10.1-SNAPSHOT/ # if needed
$ lein install
$ cd ..
$ git clone git@github.com:toyokumo/kintone-clj.git
$ git checkout fix-filename-mojibake

• add a kintone app that has 添付ファイル field
• add dev-resources/config.edn

{:auth {:basic {:username "hoge" :password "hoge"}
        :api-token "hoge"}
 :domain "hoge"
 :app 999999999}

• try dev/test.clj.

This is a draft for now (waiting for dakrone/clj-http#522 to be merged).

[saitouena]

This is a draft for now (waiting for dakrone/clj-http#522 to be merged).

Merged. Waiting for next release.

[saitouena]

dev/test.clj is ok

Loading dev/test.clj... done
(run-tests 'test)

Testing test

Ran 16 tests containing 42 assertions.
0 failures, 0 errors.
=> {:test 16, :pass 42, :fail 0, :error 0, :type :summary}

I also manually checked that file-upload uploads 日本語ファイル名.txt correctly.

[saitouena]

1d11e29 is redundant, but don't care

[makinoshi]

LGTM