test/date/test_date_parse.rb: relax the time limit

The timeout was very strict for weak CI machines like qemu-riscv.
Due to the additional overhead for Regexp.timeout=, it started failing
on such machines.

http://rubyci.s3.amazonaws.com/debian-riscv64/ruby-master/log/20220330T200018Z.fail.html.gz
```
  1) Error:
TestDateParse#test__parse_too_long_year:
Timeout::Error: execution expired
```

test/date/test_date_parse.rb

@@ -587,12 +587,12 @@ class TestDateParse < Test::Unit::TestCase
 
   def test__parse_too_long_year
     str = "Jan 1" + "0" * 100_000
-    h = EnvUtil.timeout(1) {Date._parse(str, limit: 100_010)}
+    h = EnvUtil.timeout(3) {Date._parse(str, limit: 100_010)}
     assert_equal(100_000, Math.log10(h[:year]))
     assert_equal(1, h[:mon])
 
     str = "Jan - 1" + "0" * 100_000
-    h = EnvUtil.timeout(1) {Date._parse(str, limit: 100_010)}
+    h = EnvUtil.timeout(3) {Date._parse(str, limit: 100_010)}
     assert_equal(1, h[:mon])
     assert_not_include(h, :year)
   end