electrum: re-add and update to 4.4.5; adopt

srcpkgs/electrum/files/README.voidlinux

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+Some optional packages must be installed for additional functionality:
+
+- python3-matplotlib: plot transaction history in graphical mode

srcpkgs/electrum/template

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+# Template file for 'electrum'
+pkgname=electrum
+version=4.4.5
+revision=1
+build_style=python3-module
+hostmakedepends="python3-setuptools python3-PyQt5-devel-tools"
+depends="python3-aiohttp python3-aiohttp_socks python3-aiorpcx
+ python3-bitstring python3-dnspython python3-ecdsa python3-jsonrpclib
+ python3-protobuf python3-pyaes python3-pycryptodomex python3-PyQt5
+ python3-qrcode python3-socks python3-cryptography libsecp256k1
+ python3-certifi libzbar"
+# Optional dependencies:
+#  btchip - BTChip hardware wallet support
+#  trezor - TREZOR hardware wallet support
+#  keepkey - KeepKey hardware wallet support
+#  qdarkstyle - Dark theme
+checkdepends="$depends python3-pytest"
+short_desc="Lightweight Bitcoin wallet"
+maintainer="Arjan Mossel <arjanmossel@gmail.com>"
+license="MIT"
+homepage="https://electrum.org/"
+changelog="https://raw.githubusercontent.com/spesmilo/electrum/master/RELEASE-NOTES"
+distfiles="https://github.com/spesmilo/electrum/archive/${version}.tar.gz"
+checksum=8e0f7717c8df060b1b7771604dcde28568ad3e7fd88282c84a1b3ac839d9721c
+
+post_install() {
+	vsed -i -e 's|electrum %u|electrum|' \
+		-e 's|testnet %u|testnet|' \
+		${DESTDIR}/usr/share/applications/electrum.desktop
+	vlicense LICENCE
+	vdoc "${FILESDIR}/README.voidlinux"
+}

srcpkgs/electrum/update

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+site="https://download.electrum.org"
+pattern='<a href="\K[\d.]+(?=/">)'