fixing print in shell script and updating string interpolation in python script

ci/dependabot-pr.sh

@@ -23,7 +23,7 @@ echo --- "(FAILING) Backpropagating dependabot-triggered Cargo.lock updates"
 name="dependabot-buildkite"
 api_base="https://api.github.com/repos/solana-labs/solana/pulls"
 pr_num=$(echo "$BUILDKITE_BRANCH" | grep -Eo '[0-9]+')
-branch=$(curl -s "$api_base/$pr_num" | python3 -c 'import json,sys;print json.load(sys.stdin)["head"]["ref"]')
+branch=$(curl -s "$api_base/$pr_num" | python3 -c 'import json,sys;print(json.load(sys.stdin)["head"]["ref"])')
 
 git add :**/Cargo.lock
 EMAIL="dependabot-buildkite@noreply.solana.com" \

scripts/perf-plot.py

@@ -11,7 +11,7 @@ stages_to_counters = {}
 stages_to_time = {}
 
 if len(sys.argv) != 2:
-    print("USAGE: {} <input file>".format(sys.argv[0]))
+    print(f"USAGE: {sys.argv[0]} <input file>")
     sys.exit(1)
 
 with open(sys.argv[1]) as fh: