Bump to version 77 / 1.48.1.

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    package="net.sourceforge.opencamera"

    android:versionCode="76"

    android:versionName="1.48"

    android:versionCode="77"

    android:versionName="1.48.1"

    android:installLocation="auto"

    tools:ignore="GoogleAppIndexingWarning">

    <!-- ignore GoogleAppIndexingWarning as we don't want to implement that -->