.PKGINFO parser not robust enough for special characters in optdepends

The parsing of optdepends strings in .PKGINFO is special, as right hand side of the : basically any characters (also =) may exist.

With the following example:

cat .PKGINFO
# Generated by makepkg 6.0.1
# using fakeroot version 1.29
pkgname = nvchecker
pkgbase = nvchecker
pkgver = 2.9-2
pkgdesc = New version checker for software releases
url = https://github.com/lilydjwg/nvchecker
builddate = 1657971560
packager = Chih-Hsuan Yen <yan12125@archlinux.org>
size = 378128
arch = any
license = MIT
depend = python
depend = python-tomli
depend = python-structlog
depend = python-appdirs
depend = python-tornado
depend = python-pycurl
optdepend = pyalpm: for using "sort_version_key = vercmp" in configuration files and the alpm source
optdepend = python-awesomeversion: for using "sort_version_key = awesomeversion" in configuration files
optdepend = python-lxml: for the htmlparser source
optdepend = python-packaging: for the pypi source
optdepend = git: support for git repositories
optdepend = python-gobject: for nvchecker-notify
optdepend = libnotify: for nvchecker-notify
makedepend = git
makedepend = python-docutils
makedepend = python-setuptools
makedepend = python-pygments
checkdepend = python-pytest
checkdepend = python-pytest-asyncio
checkdepend = python-pytest-httpbin
checkdepend = python-flaky
checkdepend = pyalpm
checkdepend = python-awesomeversion
checkdepend = python-lxml
checkdepend = git

We get

repod-file package inspect /mnt/mirror/community/os/x86_64/nvchecker-2.9-2-any.pkg.tar.zst
Traceback (most recent call last):
  File "/usr/lib/python3.10/site-packages/repod/files/pkginfo.py", line 192, in from_file
    key, value = [x.strip() for x in line.strip().split(" = ", 2)]
ValueError: too many values to unpack (expected 2)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/bin/repod-file", line 8, in <module>
    sys.exit(repod_file())
  File "/usr/lib/python3.10/site-packages/repod/cli/cli.py", line 189, in repod_file
    repod_file_package(args=args)
  File "/usr/lib/python3.10/site-packages/repod/cli/cli.py", line 33, in repod_file_package
    model = asyncio.run(
  File "/usr/lib/python3.10/asyncio/runners.py", line 44, in run
    return loop.run_until_complete(main)
  File "/usr/lib/python3.10/asyncio/base_events.py", line 646, in run_until_complete
    return future.result()
  File "/usr/lib/python3.10/site-packages/repod/files/package.py", line 115, in from_file
    pkginfo=PkgInfo.from_file(
  File "/usr/lib/python3.10/site-packages/repod/files/pkginfo.py", line 195, in from_file
    raise RepoManagementFileError(
repod.errors.RepoManagementFileError: An error occurred while trying to parse the .PKGINFO line optdepend = pyalpm: for using "sort_version_key = vercmp" in configuration files and the alpm source

too many values to unpack (expected 2)