Fix Echo version number which was not incremented with Release 4.6.2

[aldas]

Fix Echo version number which was not incremented with Release 4.6.2 Now bumped to 4.6.3

Relates to #2066
When I release 4.6.2 I did not use latest master branch commit but took 4 commits older commit 6b5e62b as release point. Ofcourse this point version number was not bumped to 4.6.2 and is/was still 4.6.1

I have created separate branch under labstack/echo repository to hold this fix commit as different pullable branch. But to include this change into master history this commit needs to be added into master (after those 4 commits which are not included in 4.6.2 and are already in master).

I will release 4.6.3 from this branch fix_branch_4_6_2 so 4.6.3 would only have this version number fix.

Sorry for the mess.

[codecov]

Codecov Report

Merging #2067 (04e5981) into master (6b5e62b) will increase coverage by 0.23%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2067      +/-   ##
==========================================
+ Coverage   91.33%   91.57%   +0.23%     
==========================================
  Files          33       33              
  Lines        2875     2921      +46     
==========================================
+ Hits         2626     2675      +49     
+ Misses        159      157       -2     
+ Partials       90       89       -1     

Impacted Files	Coverage Δ
echo.go	94.20% <ø> (+0.05%)	⬆️
context.go	86.93% <0.00%> (ø)
middleware/jwt.go	90.26% <0.00%> (ø)
router.go	96.51% <0.00%> (+0.74%)	⬆️
middleware/cors.go	92.13% <0.00%> (+2.97%)	⬆️

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