optimize: use HmacSHA256 instead of HmacSHA1 for ram signature

[onlinechild]

• I have registered the PR changes.

Ⅰ. Describe what this PR did

use HmacSHA256 instead of HmacSHA1 for ram signature

Ⅱ. Does this pull request fix one issue?

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[lgtm-com]

This pull request fixes 1 alert when merging 14d0412 into 8c350b0 - view on LGTM.com

fixed alerts:

• 1 for Use of a broken or risky cryptographic algorithm

[slievrly]

LGTM

[slievrly]

[codecov-commenter]

Codecov Report

Merging #4583 (df2088d) into develop (a05e5d9) will decrease coverage by 0.21%.
The diff coverage is 0.00%.

@@              Coverage Diff              @@
##             develop    #4583      +/-   ##
=============================================
- Coverage      49.45%   49.23%   -0.22%     
+ Complexity      4071     4056      -15     
=============================================
  Files            732      733       +1     
  Lines          25521    25561      +40     
  Branches        3153     3153              
=============================================
- Hits           12621    12586      -35     
- Misses         11554    11633      +79     
+ Partials        1346     1342       -4     

Impacted Files	Coverage Δ
...e/src/main/java/io/seata/core/auth/AuthSigner.java	0.00% <0.00%> (ø)
...ain/java/io/seata/core/auth/DefaultAuthSigner.java	20.00% <0.00%> (-5.00%)	⬇️
...c/main/java/io/seata/core/auth/RamSignAdapter.java	0.00% <0.00%> (ø)
...java/io/seata/core/protocol/RegisterTMRequest.java	42.85% <ø> (ø)
...io/seata/core/rpc/netty/TmNettyRemotingClient.java	55.55% <0.00%> (-0.63%)	⬇️
...source/exec/mysql/MySQLInsertOrUpdateExecutor.java	31.07% <0.00%> (ø)
...boot/autoconfigure/properties/SeataProperties.java	35.55% <0.00%> (-5.48%)	⬇️
...ing/boot/autoconfigure/SeataAutoConfiguration.java	0.00% <0.00%> (ø)
...ta/spring/annotation/GlobalTransactionScanner.java	30.65% <0.00%> (ø)
...va/io/seata/server/console/vo/GlobalSessionVO.java	22.05% <0.00%> (-33.83%)	⬇️
... and 13 more

[lgtm-com]

This pull request fixes 1 alert when merging df2088d into 8c350b0 - view on LGTM.com

fixed alerts:

• 1 for Use of a broken or risky cryptographic algorithm