fix: ビルドバージョンの表示にVersionFetcherを使用するよう修正

[MikuroXina]

Fixes #750.

Type of Change:

コードの修正

Details of implementation (実施内容)

process.env.npm_package_version を使用していた箇所を, VersionFetcher オブジェクトが (package.json 経由で) 取得したバージョン文字列に置き換えました.

[cloudflare-workers-and-pages[bot]]

Deploying with    Cloudflare Pages

Latest commit:	fb17ea7
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[codecov[bot]]

Codecov Report

Merging #1114 (fb17ea7) into main (22b39d2) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1114   +/-   ##
=======================================
  Coverage   72.43%   72.43%           
=======================================
  Files          80       80           
  Lines        5464     5464           
  Branches      486      486           
=======================================
  Hits         3958     3958           
  Misses       1021     1021           
  Partials      485      485           

Flag	Coverage Δ
unittests	72.43% <ø> (ø)

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