Calendar Updates

• Added missing XKRX holidays (2022-03-09 and 2022-06-01) by @philiptromans in #150
• Add missing Qingming and Labor Day holidays in XSHG. by @philiptromans in #156
• Add special open for BVMF on Ash Wednesday by @pbabics in #154
• Attempt to fix Korean lunar calendar bug. by @philiptromans in #152

Dev updates

• Bump actions/checkout from 2.4.0 to 3 by @dependabot in #153
• Bump actions/setup-python from 2.3.2 to 3 by @dependabot in #151

Full Changelog: 3.6...3.6.1