Fix use of static_linux_sdk_checksum local

Author: MaxDesiatov

.github/workflows/scripts/install-and-build-with-sdk.sh

@@ -108,21 +108,21 @@ find_latest_swift_version() {
 
     log "Found latest patch version: $latest_version"
 
-    local static_checksum=""
+    local static_linux_sdk_checksum=""
     if [[ "$INSTALL_STATIC_LINUX" == true ]]; then
-        static_checksum=$(echo "$releases_json" | jq -r --arg version "$latest_version" '
+        static_linux_sdk_checksum=$(echo "$releases_json" | jq -r --arg version "$latest_version" '
             .[]
             | select(.name == $version)
             | .platforms[]
             | select(.platform == "static-sdk")
             | .checksum
         ')
 
-        if [[ -z "$static_linux_checksum" ]]; then
+        if [[ -z "$static_linux_sdk_checksum" ]]; then
             fatal "No Static Linux Swift SDK checksum found for Swift $latest_version"
         fi
 
-        log "Found Static Linux Swift SDK checksum: ${STATIC_LINUX_SDK_CHECKSUM:0:12}..."
+        log "Found Static Linux Swift SDK checksum: ${static_linux_sdk_checksum:0:12}..."
     fi
 
     local wasm_checksum=""