update GitHub actions (#10)

- update GitHub actions
- give internal variables descriptive names
- minor edits

Author: RobTillaart

.github/FUNDING.yml

@@ -1,4 +1,5 @@
 # These are supported funding model platforms
 
-github: RobTillaart
+github: RobTillaart  
+custom: "https://www.paypal.me/robtillaart"
 

.github/workflows/arduino-lint.yml

@@ -1,12 +1,12 @@
-
 name: Arduino-lint
 
 on: [push, pull_request]
 jobs:
   lint:
     runs-on: ubuntu-latest
+    timeout-minutes: 5
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: arduino/arduino-lint-action@v1
         with:
           library-manager: update

.github/workflows/arduino_test_runner.yml

@@ -1,14 +1,14 @@
----
 name: Arduino CI
 
 on: [push, pull_request]
 
 jobs:
   runTest:
     runs-on: ubuntu-latest
+    timeout-minutes: 20
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: 2.6

.github/workflows/jsoncheck.yml

@@ -9,10 +9,11 @@ on:
 jobs:
   test:
     runs-on: ubuntu-latest
+    timeout-minutes: 5
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: json-syntax-check
-        uses: limitusus/json-syntax-check@v1
+        uses: limitusus/json-syntax-check@v2
         with:
           pattern: "\\.json$"