Fix Incorrect output for A or B with dim=1 in GEMM

[w8501]

Fixed a bug in the GEMM layer where incorrect shapes of M, N, and K occurred when matrix A or matrix B had dim=1, leading to incorrect output results

[codecov-commenter]

Codecov Report

Merging #4890 (b67eefc) into master (c45c01c) will increase coverage by 5.09%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master    #4890       +/-   ##
===========================================
+ Coverage   89.81%   94.91%    +5.09%     
===========================================
  Files         306      776      +470     
  Lines       86875   226096   +139221     
===========================================
+ Hits        78024   214589   +136565     
- Misses       8851    11507     +2656     

Files Changed	Coverage Δ
src/layer/arm/gemm_arm.cpp	99.56% <100.00%> (ø)
src/layer/arm/gemm_arm_asimdhp.cpp	99.57% <100.00%> (ø)
src/layer/arm/gemm_arm_vfpv4.cpp	98.58% <100.00%> (ø)
src/layer/vulkan/gemm_vulkan.cpp	98.05% <100.00%> (ø)
src/layer/x86/gemm_x86.cpp	99.83% <100.00%> (+1.10%)	⬆️

... and 645 files with indirect coverage changes