fix: fix tests after Ruby version upgrade

Author: nickysn

test/fixtures/more_types_output.txt

@@ -1 +1 @@
-[1.5, {:a=>1, :b=>2}, 1..3, #<Set: {1, 2, 3}>, 1970-01-01 00:00:00 UTC, /ab/, #<struct Point x=5, y=6>, #<OpenStruct foo=7, bar=8>]
+[1.5, {a: 1, b: 2}, 1..3, #<Set: {1, 2, 3}>, 1970-01-01 00:00:00 UTC, /ab/, #<struct Point x=5, y=6>, #<OpenStruct foo=7, bar=8>]

test/fixtures/more_types_trace.json

@@ -527,7 +527,7 @@
   {
     "Event": {
       "kind": 0,
-      "content": "1.5\n{:a=>1, :b=>2}\n1..3\n#<Set: {1, 2, 3}>\n1970-01-01 00:00:00 UTC\n/ab/\n#<struct Point x=5, y=6>\n#<OpenStruct foo=7, bar=8>\n",
+      "content": "1.5\n{a: 1, b: 2}\n1..3\n#<Set: {1, 2, 3}>\n1970-01-01 00:00:00 UTC\n/ab/\n#<struct Point x=5, y=6>\n#<OpenStruct foo=7, bar=8>\n",
       "metadata": ""
     }
   }

test/test_kernel_patches.rb

@@ -139,21 +139,21 @@ def test_correct_event_arguments
     assert_equal __FILE__, event_p[:path], "Path for p mismatch"
     assert_equal expected_line_p_detailed, event_p[:lineno], "Line number for p mismatch"
     # p calls inspect on each argument and joins with newline if multiple, but here it's one string then obj
-    assert_equal "\"detailed_p\"\n{:key=>\"value\", :number=>123}\n", event_p[:content], "Content for p mismatch"
+    assert_equal "\"detailed_p\"\n{key: \"value\", number: 123}\n", event_p[:content], "Content for p mismatch"
 
 
     event_puts = @tracer1.events[1]
     assert_equal __FILE__, event_puts[:path], "Path for puts mismatch"
     assert_equal expected_line_puts_detailed, event_puts[:lineno], "Line number for puts mismatch"
     # puts calls to_s on each argument and prints each on a new line
-    assert_equal "detailed_puts\n{:key=>\"value\", :number=>123}\n", event_puts[:content], "Content for puts mismatch"
+    assert_equal "detailed_puts\n{key: \"value\", number: 123}\n", event_puts[:content], "Content for puts mismatch"
 
 
     event_print = @tracer1.events[2]
     assert_equal __FILE__, event_print[:path], "Path for print mismatch"
     assert_equal expected_line_print_detailed, event_print[:lineno], "Line number for print mismatch"
     # print calls to_s on each argument and prints them sequentially
-    assert_equal "detailed_print{:key=>\"value\", :number=>123}", event_print[:content], "Content for print mismatch"
+    assert_equal "detailed_print{key: \"value\", number: 123}", event_print[:content], "Content for print mismatch"
 
     CodeTracer::KernelPatches.uninstall(@tracer1)
   end