Bug#1017860: grub-pc: upgrade-from-grub-legacy: needless dependency on bash

[наб]

Package: grub-pc
Version: 2.04-20
Severity: minor
Tags: patch

Dear Maintainer,

upgrade-from-grub-legacy has a /bin/bash shebang but doesn't use it,
almost at all. Please see diff to make it into /bin/sh, below.

Best,
наб

-- Package-specific info:

*********************** BEGIN /proc/mounts

-- System Information:
Debian Release: 11.4
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable-debug'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.10.0-16-amd64 (SMP w/24 CPU threads)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_FIRMWARE_WORKAROUND, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_GB:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages grub-pc depends on:
ii  debconf [debconf-2.0]  1.5.77
ii  grub-common            2.04-20
ii  grub-pc-bin            2.04-20
ii  grub2-common           2.04-20
ii  ucf                    3.0043

grub-pc recommends no packages.

grub-pc suggests no packages.

-- debconf information excluded
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