Add change dir to script dir to allow running from project root dir

tests/benchmarks/comparison.sh

@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+cd "$(dirname "${BASH_SOURCE[0]}")"
+
 if ! which hyperfine > /dev/null 2>&1; then
     echo "'hyperfine' does not seem to be installed."
     echo "You can get it here: https://github.com/sharkdp/hyperfine"

tests/benchmarks/run-benchmarks.sh

@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+cd "$(dirname "${BASH_SOURCE[0]}")"
+
 if ! which hyperfine > /dev/null 2>&1; then
     echo "'hyperfine' does not seem to be installed."
     echo "You can get it here: https://github.com/sharkdp/hyperfine"

tests/syntax-tests/update.sh

@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+cd "$(dirname "${BASH_SOURCE[0]}")"
+
 python="python3"
 if ! command -v python3 &>/dev/null; then python="python"; fi
 "$python" create_highlighted_versions.py -O highlighted