Remove trailing slash from path variable values

Paths in some workflows and tasks are configured via variables. Previously, when a value specified a folder path, a
trailing slash was added. The intent behind this was to make it slightly more clear that the value was referring to a
folder (e.g., `./` vs. `.`). However, this practice can be harmful in the case where the value is used as a base
component in a path, as then it is most appropriate to omit the path separator in the concatenation code, which is at
all clear (e.g., `FOO_PATH: foo/`, `{{.FOO_PATH}}bar` -> `foo/bar`). And if the separator is used in the concatenation
code, it results in a confusing double separator in the resulting path (e.g., `FOO_PATH: foo/`, `{{.FOO_PATH}}/bar` ->
`foo//bar`). The benefit of the trailing slash on the variable definition is miniscule at most, since the variable name,
documentation, and other context should make it obvious that the value is a folder path. So the harm of this approach
outweighs the benefit.

For this reason, it is better to omit the trailing slash in the variable definition (e.g., `FOO_PATH: foo`,
`{{.FOO_PATH}}/bar` -> `foo/bar`). Even though this approach is not relevant in cases where the path is not used as a
base component, it is best to be consistent in this practice.

Author: per1234

.github/workflows/check-go-task.yml

@@ -62,7 +62,7 @@ jobs:
 
       matrix:
         module:
-          - path: ./
+          - path: .
           - path: docsgen
           - path: ruledocsgen
 
@@ -99,7 +99,7 @@ jobs:
 
       matrix:
         module:
-          - path: ./
+          - path: .
           - path: docsgen
           - path: ruledocsgen
 
@@ -142,7 +142,7 @@ jobs:
 
       matrix:
         module:
-          - path: ./
+          - path: .
           - path: docsgen
           - path: ruledocsgen
 
@@ -185,7 +185,7 @@ jobs:
 
       matrix:
         module:
-          - path: ./
+          - path: .
           - path: docsgen
           - path: ruledocsgen
 
@@ -228,7 +228,7 @@ jobs:
 
       matrix:
         module:
-          - path: ./
+          - path: .
           - path: docsgen
           - path: ruledocsgen
 

.github/workflows/check-license.yml

@@ -65,7 +65,7 @@ jobs:
 
       matrix:
         check-license:
-          - path: ./
+          - path: .
             expected-filename: LICENSE.txt
             # SPDX identifier: https://spdx.org/licenses/
             expected-type: GPL-3.0

.github/workflows/test-go-task.yml

@@ -73,7 +73,7 @@ jobs:
           - windows-latest
           - macos-latest
         module:
-          - path: ./
+          - path: .
             codecov-flags: unit
           - path: ruledocsgen/
             codecov-flags: unit

Taskfile.yml

@@ -9,7 +9,7 @@ vars:
   PROJECT_NAME: "arduino-lint"
   DIST_DIR: "dist"
   # Path of the project's primary Go module:
-  DEFAULT_GO_MODULE_PATH: ./
+  DEFAULT_GO_MODULE_PATH: .
   DEFAULT_GO_PACKAGES: |
     $( \
       go list \