Remove old upload code to prevent uploading twice

As we now upload in dedicated job to our own repo without any
intermediary, there's no need to keep the upload-build script nor the
steps executing it

scripts/upload-build

@@ -1,47 +0,0 @@
-#!/usr/bin/env bash
-
-set -e
-
-if [[ "$#" -ne 4 && "$#" -ne 5 ]]; then
-    echo 'Upload an OpenRCT2 build to openrct2.org.'
-    echo ''
-    echo 'Usage: upload-build <path> <flavour> <version> <sha1> [<branch>]'
-    echo 'Flavours: windows-portable-x86, windows-portable-x64'
-    echo '          windows-installer-x86, windows-installer-x64'
-    echo '          windows-symbols-x86, windows-symbols-x64'
-    echo '          macos'
-    echo '          linux-i686, linux-x86_64'
-    echo '          android-arm, android-x86'
-    echo ''
-    echo 'Environment variable ''OPENRCT2_ORG_TOKEN'' must be set.'
-    exit 1
-fi
-
-path=$1
-flavour=$2
-version=$3
-sha1=$4
-branch=$5
-
-if [ -n "$branch" ]; then
-    versionextra=-$branch-${sha1::10}
-fi
-filename=OpenRCT2-$version$versionextra-$flavour
-
-echo -e "\033[0;36mUploading to openrct2.org as '$filename'..."
-if [ -z "$OPENRCT2_ORG_TOKEN" ]; then
-    echo -e "\033[0;31mOPENRCT2_ORG_TOKEN not set"
-    exit 1
-fi
-# Use HTTP1.1 as a workaround for curl bug:
-# https://github.com/actions/runner-images/issues/7329
-# https://github.com/curl/curl/issues/10591
-curl --include -m 300 --connect-timeout 5 -o - \
-    --http1.1 \
-    --form "key=$OPENRCT2_ORG_TOKEN" \
-    --form "fileName=$filename" \
-    --form "version=$version" \
-    --form "gitHash=$sha1" \
-    --form "gitBranch=$branch" \
-    --form "file=@$path" \
-    "https://openrct2.org/altapi/?command=push-build"