sshpass & svn commit in script: Works when script run manually, fails when run with Cron

I have written a Bash script that I use to automatically update certain files that I store on SourceForge and GitHub. Near the end of the file, I have two commands that Rsync the updated files to SourceForge and Svn Commit them to GitHub, respectively (before anyone asks, I have my reasons for using Svn rather than Git).

My problem is that while the script does what it needs to do when I run it manually, the line of code that commits the changes to GitHub fails with an authentication error.

I have programmed the script to output the contents of Stderr into a log file. This is the contents of that file after I run the script manually and it works:

auto_update_svn.bash:
17 Sep 2018 18:42 UTC
SSHPASS searching for password prompt using match "assword"
SSHPASS read: Authentication realm: <https://github.com:443> GitHub
SSHPASS read:

SSHPASS read: Password for 'XJDHDR':
SSHPASS detected prompt. Sending password.
SSHPASS read: *
<"SSHPASS read: *" repeated another 25 times
SSHPASS read:

SSHPASS read:

This is what that log says after I run the script through Crontab and it fails:

auto_update_svn.bash:
16 Sep 2018 14:00 UTC
svn: E215004: Authentication failed and interactive prompting is disabled; see the --force-interactive option
svn: E215004: Commit failed (details follow):
svn: E215004: No more credentials or we tried too many times.
Authentication failed
svn: E200042: Additional errors:
svn: E120191: Error running context: The requested authentication type(s) are not supported

From what I can see, sshpass is not running when I run it with Cron and so Svn doesn't receive a password. Strange because a few lines earlier, I use sshpass with Rsync to send file to SouceForge and that works when the script is run through Cron. One solution I've often seen is related to the Path environment variable in Cron being limited. I fixed this in my case with this line near the top of my script but it doesn't help in my case: PATH=$PATH:$(grep 'PATH=' /etc/environment | sed 's/^.*=// ; s/\"//g')

This is what I have in my Crontab:

0 14 *   *   *        /bin/bash /home/svn/xjdhdr-random-code/Bash/auto_update_svn.bash

And this is the contents of my script:

#!/bin/bash

PATH=$PATH:$(sed -n '/PATH=/s/^.*=// ; s/\"//gp' '/etc/environment')

sDateTime=$(date -u +"%d %b %Y %H:%M")
{
        # Commit changes
        #   SourceForge
        sshpass -f "$HOME/sourceforge_password.txt" rsync -qcruz -e ssh --exclude=.svn '/home/svn/xjdhdr-random-code/' \
                '[email protected]:/home/frs/project/xjdhdr-random-code/'

        #   GitHub
        svn status '/home/svn/xjdhdr-random-code/' | grep ^\? | cut -c2- | while IFS='' read -r sFile
        do
                svn add "$sFile"
        done
        sshpass -v -f "$HOME/github_password.txt" svn commit --username=XJDHDR --no-auth-cache \
                -m 'Automatic update of Adblock, Bash + blocklist files' '/home/svn/xjdhdr-random-code'
} 2> '/tmp/stderr-contents-auto_update_svn.txt'

if [ -f '/tmp/stderr-contents-auto_update_svn.txt' ]
then
        errors+=$(cat '/tmp/stderr-contents-auto_update_svn.txt')
        rm -f '/tmp/stderr-contents-auto_update_svn.txt'
fi


if [ -n "$errors" ]
then
        printf 'auto_update_svn.bash:\n%s UTC\n'"$errors"'\n\n' "$sDateTime" >> '/home/error_reports_to_email.txt'
fi