doc: Update license year range to 2021 #20805

1. 
   emilengler commented at 3:26 pm on December 30, 2020: contributor

   See #17801, #15061 The same procedure as every year. Happy new year to all of you :)
2. doc: Update license year range to 2021 ccc8d5513f
3. DrahtBot added the label Build system on Dec 30, 2020
4. DrahtBot added the label Docs on Dec 30, 2020
5. DrahtBot added the label Scripts and tools on Dec 30, 2020
6. MarcoFalke removed the label Build system on Dec 31, 2020
7. MarcoFalke removed the label Scripts and tools on Dec 31, 2020
8. MarcoFalke merged this on Dec 31, 2020
9. MarcoFalke closed this on Dec 31, 2020

   ---

10. sidhujag referenced this in commit eda82ea521 on Dec 31, 2020
11. MarcoFalke referenced this in commit bcf2b25eec on Jan 3, 2022
12. DrahtBot locked this on Aug 16, 2022

Contributors
emilengler

Labels
Docs